536 MR. E, A. SMITH ON A NEW CARINIFEX. (Nov. 2 
Naseus dahuricus, Bas. Ichth. Chin. bor., Nouv. Mém. Moscou, 
x. p. 234. 
Naseus dauricus, Bas. ibid. tab. 7. fig. 1 
Elopichthys dauricus, Blkr. Act. Soc. Se. 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 Envear A. Smiru, F.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 Philadel- 
phia, 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 in 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. 
éreweri has been in vain. 
CaRINIFEX PONSONBIT, Sp. nov. 
Testa subdiscoidalis, tenuis, latissime et profundissime umbilicata, 
corneo-alba, epidermide fugaci tenuissima pallide olivacea in- 
duta; 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, su- 
perne late sed minime profunde excavatus, infra excavationem 
aliquanto carinatus, infra carinamleviter convexiusculus, inferne - 
circa umbilicum subobtuse carinatus ; apertura magna, trian- 
gularis, inferne subcanaliculata, superne leviter ascendens ; 
