On new Shells from Lake Tangani/ika. 93 



Reptiles and Bat rachians were sent to the British Museum by 

 Dr. Emin Pasha : — 



South Shore of Victoria Nyanza. — Nucras fessellata, Smith ; 

 Eremias SpeMi, Gthr. ; Lygosoma modesfum, Gtlir. (a single 

 specimen, with 24 scales round the body and the nasal com- 

 pletely divided into two) ; Dromophis aiigolensis, Bocaga ; 

 Psammophis hiseriatus, Ptrs. ; Thelotornis Kirtlandii, Hallo .v. 



Ugogo. — Megalixalus Fornasinii^ Bianconi. 



VII. — On a new Genus and some new Species of Shells from 

 Lake Tanganyika. By Edgar A. Smith. 



Mr. E. Coode Hore recently presented to the British Mu- 

 seum a few Tanganjnkan shells preserved in spirit and con- 

 taining the animals. Among them are two specimens of 

 Paramelania nassa^ var. grandis *. 



This variety I now propose as the type of a new genus, 

 which may be designated Nassopsis, distinguished from Para- 

 melania t (henceforth reserved for P. Damoni and P. crassi- 

 granulata) ]mrtly on account of certain differences in the 

 shell, but more especially as the operculum is of an entirely 

 different type. 



In Paramelania the aperture of the shell does not exhibit 

 the sinuation or subtiuncation of the columella which is so 

 conspicuous in typical A^assopsisy and the anterior extremity 

 of the last whorl has a slightly produced appearance ; the outer 

 lip also is more thickened. The operculum in Paramelania 

 is large, ovate, paucispiral at the nucleus, situated a little 

 within the left margin and about equidistant from the ends, 

 and subsequently displays a concentric style of growth. That 

 of Nosso2Jsis is small and somewhat paucispiral at the almost 

 terminal nucleus. 



Nassopsis nassa, var. grandis. 



Animal with the foot small, broader in front than behind, 

 with the anterior margin double; sides of the foot and head 

 blackish ; proboscis compressed, broad and truncate at the 

 end ; tentacles also black, except at the tips, which are pale, 

 very short, conical, swollen at the base on the outer side, 

 probably denoting the position of the eyes ; free edge of the 

 mantle dark-coloured and subdenticulate. 



* Proc. Zool. Soc. 1881, p. 5G1, pi. xxxiv. fio-. 26 a. 

 t i. c. p. 559 {■= Bourgtdgnatia, Giraud). 



