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Show 536 MR. E. A. SMITH ON A NEW CARINIFEX. [Nov. 2, Naseus dahuricus, Bas. Iohth. Chin, bor., Nouv. Mem. Moscou, x. p. 234. Naseus dauricus, Bas. ibid. tab. 7. fig. 1 • Elopichthys dauricus, Blkr. Act. Soc. Sc. Ind. Neerl. vii. Cyprin. p. 286. Basilius (Opsarius) bambusa, Kner, Zool. Reis. Novara, Fisch. p. 357. Hab. Sina, in flumine Yang-tse-kiang (test. clar. Dobson). Lon-gitudo speciminis descripti, 235'". La Haye, 20 Juin, 1875. 2. Description of a new Species of Carinifex from California. By EDGAR A. SMITH, P.Z.S. [Received June 23, 1875.] A very peculiar form of Planorbis, from California, was described by Mr. Isaac Lea in the Proceedings of the Academy of Philadelphia, 1854, p. 51, under the name P. newberryi. Subsequently Mr. G. Binney deemed this so remarkable a shell as to merit generic rank, and consequently he proposed to distinguish it by the name Carinifex (see Cat. North-American Pulmonata, Dec. 9, 1863). The same idea appears to have occurred to Mr. Lea himself; for in January of the succeeding year (Proc. Acad. Philad. Jan. 1864) he describes his species with the generic title of Megasystropha. In neither instance is a diagnosis given; but iu the American Journ. Conchol. i. 1865, p. 50, Binney describes Carinifex and figures C. newberryi on pl. 7. figs. 6, 7. He also mentions the existence of a second species, C. breweri of Newcomb, and observes, " the latter (C. breweri) may prove but a variety of the former" (C. newberryi). Whether this be the same as the following species or not I cannot say; but all search to find the description of any species entitled C. breweri has been in vain. CARINIFEX PONSONBII, sp. nov. Testa subdiscoidalis, tenuis, latissime et profundissime umbilicata, corneo-alba, epidermide fugaci tenuissima pallide olivacea induta ; anfractus 5, convexiusculi, rapide accrescentes, superne paululum suturam infra obsolete angulati, incrementi striis per-arcuatis exilissime sculpti, sutura profunda discreti; spira parum supra anfr. ultimum elevata; anfr. ult. maximus, superne late sed minime profunde excavatus, infra excavationem aliquanto carinatus, infra carinamleviter convexiusculus, inferne circa umbilicum subobtuse carinatus; apertura magna, triangularis, inferne subcanaliculata, superne leviter ascendens |
