PECTEN (NEITHEA), sp. An imperfect specimen which appears to be part of a left valve of Neithea is present in the collection. PERNA, sp. Text-figures 4-6. There are twelve internal casts of a large sub-quadrate Perna. In some cases portions of the shell are preserved and show a prismatic structure similar to that seen in P. Ricordeana, d'Orb. FIG. 5.-Perna, sp. Internal cast. Left valve and anterior view of both valves. The posterior and the ventral margins are imperfect. × 3. The largest specimen has a height of about 150 mm., and its hingeline is about 85 mm. long. One example shows the cast of the ligament area and grooves. This species resembles P. valida (Stoliczka)* from the Ariyalur Group (Senonian) of Southern India, * Cret. Fauna S. India, vol. iii. (1871), p. 409, pl. xxii., fig. 1. and also P. cereviciana, Pethö, from the Senonian of Čerevic (Hungary). But more perfect specimens are needed before an exact determination can be made. The ligament grooves are less numerous and more widely separated than in P. cereviciana, but FIG. 6.-Perna, sp. Internal cast. A considerable portion of the posterior part of the shell appears to be missing. x. the flattened part of the shell extending ventrally from the umbo is similar in both species. Die Kreide- (Hypersenon-) Fauna d. Peterwardein. Gebirges (Palæontographica, lii., 1906), p. 234, pl. xvii. NOTE ON THE LOCALITY. These fossils were obtained by Mr. J. W. Woods, of East London, from Need's Camp, on the Buffalo River, twenty miles from the sea and at an altitude of about 1,200 feet. Mr. Woods says the limestone is "exposed in two open workings about two miles apart, and the one about fifty feet higher than the other. In the lower the greatest thickness is six feet and seems to be composed entirely of the remains of small shells, echinids, cup-corals, and various spines. . . . In the upper quarry the limestone is mainly crystalline and hard, and seems to be a mass of shell of mussel type: a few 'shark's' teeth have been found in it. We had a section there of eight feet to examine, and how much more exists cannot be stated as the workings have not gone deeper. "The areas where the deposits occur are completely enclosed by dolerite: they may be described as two level ten-acre lots surrounded by boulders; and were, I presume, old shore-basins or lagoons, walled in by the igneous dyke, where the molluscs lived and died, or into which they were gradually swept by the tide." The interest of this fauna is very great because it occurs at a place more than half-way between the Pondoland Upper Cretaceous outcrops and the main area of the marine Lower Cretaceous in Uitenhage. No fossils from similarly situated beds have been described, though limestones like that from the top quarry at Need's Camp are known from the neighbourhood of Sand Flats at about 1,200 feet above sea-level. A. W. ROGERS. * This is the figure given by Mr. Woods; it is probably too great by 100 feet, as in Gamble's list of heights the Need's Camp beacon is said, on the authority of Capt. W. Bailey, R.E., to be 1,144 feet above sea-level. EXPLANATION OF PLATE I. POLYZOA AND ECHINOIDEA FROM THE UPPER CRETACEOUS OF NEED'S CAMP, BUFFALO RIVER, CAPE COLONY. 1. Filisparsa ramosa, d'Orbigny. × 12. Obverse face of part of a zoarium, showing tendency of apertures to be arranged in V-shaped rows (p. 408). 2. Filisparsa fragilis, Marsson. x 12. Obverse face of part of a zoarium (p. 408). 3. Diastopora compressa (Goldfuss). × 12. A young zoarium, showing the firstformed zoœcia to be slightly emergent, while the more distal are immersed (p. 409). 4. Idmonea virgula, d'Orbigny. x 12. Obverse face of zoarium (p. 410). 5. Crisina cenomana, d'Orbigny. x 12. Obverse face of a specimen resembling d'Orbigny's figure of Idmonea calypso, showing strongly-marked zoœcial boundaries (p. 411). 6. Crisina excavata (d'Orbigny). x 12. Obverse face of part of a zoarium. In the proximal part the lateral series of apertures of each side are practically opposite, and so appear to form continuous bands across the zoarium. Distally is a front view of the right-hand series only, and those of the left-hand are seen in profile (p. 412). 7. Crisina marginata (d'Orbigny). × 12. Obverse face of part of a zoarium viewed rather from the right side, so that only the edges of the left-hand series of apertures appear; the alternate arrangement of the series of apertures is therefore not obvious in the figure (p. 412). 8. Tervia dorsata (von Hagenow). × 12. Obverse face of part of a zoarium (p. 413). 9. Tervia gibbera, Gregory. × 12. Obverse face of part of a zoarium viewed from the left-hand side. The end of a "dorsal process 99 appears at the top left-hand side of the figure, springing distally from the reverse face (p. 413). 10. Entalophora virgula (von Hagenow). × 12. Part of a zoarium (p. 414). 12. Entalophora echinata (Römer). x 12. Part of a worn zoarium (p. 415). (p. 416). Part of a worn zoarium 15-17. Coptosoma capense, sp. nov. Natural size. (p. 419). |