PLATE XVI. (Crustacea, PLATE XLII.)

Nasinatalis disjunctipes, n.g. et sp.

n.s., n.s. Lines indicating the natural size of the adjoining figures, the upper representing a specimen in dorsal view, the lower a smaller specimen in ventral view. To the right of the latter is a more enlarged portion of the front in dorsal view, showing the position of the first antennæ, a.s., a.s., in relation to the eyes.

Pl. s., 5-7. The fifth, sixth, and seventh segments of the pleon of the uppermost figure in dorsal view.

mxp. 3, D., mxp. 3, L., mxp. 3, V. The dorsal or inner, the lateral, and the ventral or outer aspects of the third maxillipeds.

br., br. Two of the branchiæ, each showing two biseriate plumes connected only at the base.

prp. 1, pp. 2, prp. 5. The first peræopod or cheliped, the second, and the fifth

percopods.

PLATE XVII. (Crustacea, PLATE XLIII.)

Parapagurus bouvieri, n. sp.

3. The figure below gives an enlarged dorsal view of the cephalothorax, showing in position the eyes, first antennæ, acicles of the second, the chelipeds, second peræopods, and on the left the third peræopod. Protruding on the right are the extraneous bladder-like organisms.

a.s., mxp. 3, prp. 1, prp. 2. These letters are attached to a lateral view of the cephalothorax, showing in position an eye, a first antenna, a maxilliped, the larger right-hand cheliped (first peræopod), and the second peræopod. The extraneous organisms are seen at the bases of the third maxilliped and the second peræopod. In these composite figures the exact relative sizes are not preserved, owing to the difficulty of focussing under the microscope.

T. The telson and the uropods in connection with the sixth pleon segment.
One of the eyes, much magnified.

OC.

a.s., a.i. The first antenna and the peduncle of the second, magnified to the same scale as the separated eye, but not so highly as the following details. prp. 4, prp. 5. The three terminal joints of the fourth, and two terminal of the fifth peræopod.

plp. 1., plp. 1, plp. 2. The convex and concave sides of the first pair of sexually modified male pleopods, in position between the cox of the fifth peræopods; and one of the second pair.

urp., urp. The uropods magnified to the same scale as prps. 4, 5, plps. 1, 2, and the higher enlargement of the telson.