278 MR. E. A. SMITH ON SHELLS FROM [Feb. 15, 



C Irmissianum, Reeve (non Pfr.), Con. Ic. fig. 52. 



Var. =C'. lineatum, Pfr. Con.-Cab. pi. 45. f. 3—4; Reeve, Con. 

 le. f. 46? 



Hah. Between Lake Nyassa and the east coast (Thomson). 



The shells from the above locality differ in some respects from the 

 typical form of this species, yet scarcely sufficiently and persistently to 

 enable me to describe them as distinct. The main difference is that 

 of form and in the size of the aperture. In the smallness of the 

 latter, four of them correspond with what I believe is only a variety 

 of this species, viz. C. lineatum of Pfeiffer. Two others are more 

 depressed, and have the last whorl, umbilicus, and aperture unusually 

 large. It may be as well to point out the fact (which as far as I 

 know, has not been previously noticed) that the true C. kraussianiim 

 of Pfeiffer is a very distinct species from that which appears as such 

 in the monograph by Reeve, who in its stead merely figures (pi. ix. 

 fig. 52) a second example of the present species, which he correctly 

 delineates on the previous plate (fig. 41). The shell represented 

 by him (fig. 46) as C. lineatum is not the type described by Pfeiffer, 

 which is accurately depicted by the latter author in the ' Conchylien- 

 Cabinet,' I may also take this opportunity of pointing out that the 

 € . goudotianum ofSowerbyisa very distinct species from that figured 

 by Pfeiffer (Conch.-Cab. pi. 13. figs. 8-10) under that name; also 

 Reeve's figure (no. 42 a) correctly delineates the original type of the 

 same species, but figure 42 b merely represents a smooth variety of 

 the G. insulare. Although C. goudotianum is stated by the describer 

 to have been collected iu Natal by Dr. Krauss, I am of opinion 

 that it will eventually prove to be a Madagascar species. In the 

 expansion of the lip, its tout ensemble, and the presence of a colour 

 band within the umbilicus (a feature not met with in species of 

 this genus from South Africa, and which occurs in some from 

 Madagascar and also iu several species of Helix from that island) it 

 calls to mind certain forms from the latter locality. The name (insu- 

 lare) of this species is an unfortunate one ; but until it is proved 

 that it is without doubt distinct from the old C. ligatum it may be 

 desirable to retain it. 



3. Helix (Nanina?) nyassana. (Plate XXXII. figs. 2-2 6.) 



Shell narrowly umbilicated, thin, depressed, keeled, rather glossy 

 brownish horn-colour ; spire shortly conical. Whorls 5|, moderately 

 convex, impressed beneath the suture, and depressed or shallowly 

 channelled at the lower part immediately above the suture. Sculp- 

 ture consisting of distinct and somewhat prominent lines of growth, 

 crossed with close concentric microscopic striae ; last whorl large, 

 keeled and angled above the middle, convex beneath ; keel not acute; 

 groove just above it distinct but not deep. Aperture obliquely 

 lunate. Peristome thin, only expanded slightly over the umbilicus. 

 Greatest diameter 25 niilhms., smallest 21; height 13; aperture 10 

 long, 13 broad. 



Hah. Between Lake Nyassa and the east coast (Thomso)i). 



The spiral sculpture which adorns this very interesting shell is 



