The pleopods have two little serrate coupling spines on the second joint of the peduncle, and several cleft spines on the

inner ramus.

The uropods in the smaller specimen have their apices almost on a level; in the larger those of the first pair do not reach quite so far back as the other two; the outer branch in the first and second pairs is shorter and more serrate than the inner; the third pair have the branches laminar, much longer than the peduncle, the outer slightly the longer, with a little second joint, liable to wear and tear, which led Bovallius to believe that it was only a character of the young. All the margins appear to have a microscopic serration.

The telson is longer than broad, narrowing distally, the cleft between the rounded apices reaching up two-fifths of the length in the larger specimen, a little less in the smaller.

Length of smaller specimen 10 mm., of the larger 13 mm., 11 mm. from front of head to end of third pleon segment, and about 2 mm. from third pleon segment to end of telson.

Locality. The smaller specimen was taken off Buffalo Bay, S.W. by W. W. 33 miles, in 32 fathoms; the larger in lat. 33° 9′ 30′′ S., long. 28° 3' 00" E., in 47 fathoms. From this latter station a very small specimen shows quite conspicuously the character of the last peræopods.

The specific name, meaning oar-footed, refers to the blade-like character of the fifth peræopods.

GEN. HIPPOMEDON, Boeck.

1871. Hippomedon, Boeck, Forh. Selsk. Christian, 1870, p. 102. 1906. Hippomedon, Stebbing, Das Tierreich, Amphipoda, pp. 58, 719.

HIPPOMEDON LONGIMANUS, Stebbing.

1888. Platamon longimanus, Stebbing, Challenger Amphipoda, Reports, vol. xxix., p. 643, pl. 13.

1906. Hippomedon longimanus, Stebbing, Das Tierreich, Amphipoda, p. 60.

In the South African specimen, as in the larger North Atlantic Challenger specimen, no trace of eyes was apparent.

The colour in spirit is pale greenish, with speckling observable under the microscope.

Length, 11 mm.

Locality. Table Mountain E. 41 miles; depth, 245 fathoms;

bottom, green sand. The Challenger specimen about 17 mm. long, was taken off Cape Finisterre at a reputed depth of 1,125 fathoms.

GEN. TRYPHOSA, Boeck.

1871. Tryphosa, Boeck, Forh. Selsk. Christian., 1870, p. 117. 1906. Tryphosa, Stebbing, Das Tierreich, Amphipoda, pp. 68, 720.

TRYPHOSA ONCONOTUS, n. sp.
Plate XXXV.

There are two features of rather particular interest in this speciesthe dorsal hook on the fourth pleon segment, and the accessory lobe on the branchial vesicles. The first of these may be compared with the furcate dorsal process on the same segment in Pontoporcia femorata, Kröyer, and with the arrangement in Guernea coalita (Norman). Hansen, in his description of the adult female, shows that the latter species is in fact provided with a sort of hook, the fourth pleon segment having, behind the dorsal depression, a high rounded carina, which is produced in front into a small rounded process. In Acanthogammarus belkinii (Garjajeff) each of the first four pleon segments has a dorsal process projected forwards.* The suggestion may be ventured that in all these cases a facility is provided for the male to hold the female firmly, in agreement with the explanation of the modified sixth pair of side-plates in the female of Melita palmata (Montagu). The accessory lobe with which the branchia are provided in the new species is not perhaps very unusual. Such a lobe is described and figured by Sars in the Crustacés d'eau douce de Norvège for Gammaracanthus lacustris.

Head with lateral angles acutely produced. Side-plates of peræon well developed, first not distally narrowed, first and second with minute denticle at lower hind angle, fourth excavate behind. Postero-lateral angles quadrate in second pleon segment, rounded in first and third. Fourth pleon segment with deep dorsal depression followed by an upturned triangular process directed forward so as sometimes to overlap the hind margin of the third segment.

Eyes not perceptible. First antennæ short, peduncle consisting of one rather bulky joint followed by two small ones, flagellum scarcely longer than peduncle, with nine joints, the first considerably the largest; accessory flagellum three-jointed. Second antennæ not

In the Amphipoda Gammaridea of Das Tierreich, the name of Garjajeff's abovementioned species is erroneously given as balkirii.

twice as long as the first, fourth joint about equal to the first three combined, fifth rather shorter, flagellum fifteen-jointed, longer than the peduncle.

The lips showed no exceptional character, unless the difficulty of detaching them from the œsophagus could be so accounted.

The mandibles have a prominent molar with denticulate circular crown. On the left mandible a very small strap-shaped accessory cutting plate is seen, and a spine-row of two very small spines. The inner plate of the first maxillæ carries two unequal setæ, the serrate spines on the outer plate and the spine-teeth on the long second joint of the palp are all very short. In the second maxillæ the outer plate is somewhat longer and broader than the inner. Both the inner and outer plates of the maxillipeds are rather long, the outer fringed on the inner margin with nine spine-teeth, of which the lower ones are distant and very small. This plate reaches beyond the second joint of the palp.

The gnathopods are not powerful. In the first pair the third joint is about as long as the fourth, the fifth rather longer than the sixth, which widens slightly to the very oblique palm. This is a little overlapped by the finger when closed. The tip of the finger has a small cap, which is also the case in the first and second peræopods. In the second gnathopods the third joint is considerably longer than the fourth, and the fifth than the rather stout sixth, of which the palm is faintly excavate. The small finger is apically bidentate. Whether the branchial vesicles of these limbs have an accessory lobe was not made out. The lobes attain their greatest development in the third and fourth peræopods. The marsupial plates of the specimen figured were very narrow.

The first and second peræopods are similar, slender throughout. The three following pairs have the second joint strongly expanded, but only feebly serrate. In the third and fifth pairs this joint is proximally almost as broad as the length, in the fourth pair its breadth is much more uniform and considerably less than the length. The fourth joint in the third pair is nearly as broad as long, otherwise all joints but the second are moderately narrow.

The pleopods have two little coupling hooks, a few cleft spines, and the branches about seventeen-jointed. The uropods have but few spines on the rami, which in each pair are subequal, longer than the peduncle only in the third pair; in this the outer branch. has a well-marked second joint, and the inner branch is longer than the first joint of the outer.

The telson is divided nearly to the base, with a spine in the apical

notch of each division, and two spines near each outer margin, with a feathered setule near the upper one.

The specimen figured measured 7 mm. in length. Another specimen, measuring only 4-5 mm., had the marsupial plates less developed and the telson less narrowed apically.

Locality. Table Mountain E. 41 miles; depth, 245 fathoms; bottom, green sand. The specific name, from oykóç (hook), and voros (back), refers to the dorsal process on the fourth segment of the pleon.

One specimen presents an appearance probably abnormal. The upper hind margin of the third pleon segment was in contact with the telson. When these parts were pulled asunder it was found that all the three terminal segments of the pleon were enclosed within the third segment, which showed through its pellucid integument the dorsal outline of the fourth in its natural condition, that is, with a rounded boss, deep cavity, and uplifted triangular process. The segments resisted endeavours to draw them into the in a way that proved their position to be no result of accidental intrusion. The specimen measured 4 mm. from front of head to end of third pleon segment. The principal flagellum of the first antennæ is six-jointed, the flagellum of the second nine-jointed.

GEN. AMARYLLIS, Haswell.

open

1880. Amaryllis, Haswell, P. Linn. Soc. N.S. Wales, vol. iv., p. 253. 1906. Amaryllis, Stebbing, Das Tierreich, Amphipoda, p. 23.

Dr. Chilton has recently pointed out that the species which he described in 1885 as Glycerina affinis is in fact Amaryllis macrophthalmus, Haswell.

AMARYLLIS MACROPHTHALMUS, Haswell.

1880. Amaryllis macrophthalmus, Haswell, P. Linn. Soc. N.S. Wales, vol. iv., p. 253, pl. 8, fig. 3.

1885. Glycerina affinis, Chilton, P. Linn. Soc. N.S. Wales, vol. ix, p. 1036, pl. 47, fig. 1, a, b.

1902. Amaryllis macrophthalmus, G. M. Thomson, Ann. Nat. Hist., Ser. 7, vol. x., p. 463.

1905. Amaryllis macrophthalmus, Chilton, Tr. N.Z. Inst., vol. xxxviii., p. 267.

1906. Amaryllis macrophthalma, Stebbing, Das Tierreich, Amphipoda, p. 24.

The report on this species in the Challenger Amphipoda was based on a very small and obviously young specimen from Patagonia, com

pared with a large female specimen from Australia. The specimens obtained by Dr. Gilchrist in South Africa include fully developed males and other individuals of which it is desirable that some notice should be taken.

In the mature male the eyes are very conspicuous by their dark colour and considerable size. They are rather broader above than below and are almost contiguous on the top of the head. The first antennæ have the first joint large with two blunt apical teeth, the second and third joints short, the principal flagellum rather stout, 28-jointed, the calceoli small, its first joint by far the largest, furnished with a brush of filaments; the secondary flagellum 8-jointed. The second antennæ have the first three joints very short, the fourth large, the fifth short, carrying a slender, calceoliferous, 74-jointed flagellum, which reaches beyond the pleon, making the whole of this pair between two and three times as long as the first pair.

The upper and lower lips are not easily detached one from the other. The upper lip appears to have a bilobed margin. The mandibular processes of the lower lip are long and narrow. In the mandibles the spines of the spine-row are excessively short, and the molar is a thin backward-directed roughly triangular plate, fringed with setules. The second joint of the palp is the longest, and this in its upper half is fringed with some 14 slender spines. M. Bonnier found no armature on this joint in his A. pulchella, nor did I in A. bathycephalus, A. haswelli, or the small specimen of A. macrophthalmus. It may be noted that the triturating organs, or cardiac folds of the stomach, are more circular than usual, and are fringed with slender spines. But this is no speciality of the male. The first and second peræopods are distinguished by having the fourth and fifth joints fringed along the hind margin with long stiff setæ, which are not seen in the female or young male.

In the third segment of the pleon the postero-lateral notch is higher up than in the young. The third uropods have the subequal lanceolate rami fringed with long plumose setæ on the inner margin, and the inner ramus is fringed on the lower part of the outer margin.

A specimen, about 7 mm. long, presumably not fully adult, showed the following differences. The eyes were much more slender, uniform in breadth, pale in colour. The first antennæ have the two distal teeth of the first joint acute, the principal flagellum 26- or 27-jointed, with the first joint of much less length than in the other specimen, and the secondary flagellum seven-jointed. The second antennæ are no longer than the first, with a flagellum of