378 MR. E. A. SMITH ON THE [•''^P'"- 1^> 



has five or six lines on the penultimate whorl, and is a more elevated 

 shell than C. consanguineum (= obsoIeUtm, Rve.), in both these 

 respects agreeing very vvell with C. madac/ascariense of Grray, wliich I 

 consider almost identical with, or at most only a slight variety of, C. 

 unicarinatum of Lamarck (non C. unicarinatum of Sowerby, Pfeiffer, 

 and Reeve, = C . fulvifrons, Sowerby). 



Cyclostoma johnsoni, sp. nov. (Plate XXI. figs. 4, 5.) 



Shell small but thickish ; white, with a single purple-brown zone a 

 little below the middle of the body-whorl ; openly umbilicated, finely 

 lirate upon the spire, smoother upon the last volution, especially on 

 the lower surface, striated by lines of growth. Whorls 5, convex, 

 separated by a deep suture, first two smooth, the third with about 

 five fine spiral lirse, the penultimate witli about eight rather finer 

 ones, increasing in number but much more feebly developed upon 

 the upper half of the last whorl, and quite obsolete beneath the 

 periphery, and scarcely traceable within the umbiUcus. Aperture a 

 trifle oblique, subcircular, a little longer than wide, white, with the 

 single band. Peristome continuous, expanded all round, rather 

 more so on the columellar side than on the opposite margin. 



Greatest diameter 14 millim., height 134; aperture 8 long, 6| 

 wide. 



Hub. South of Trabonjy, north-west central part of Madagascar 

 (^Johnson). 



This very interesting species is not likely to be confounded with 

 any previouslv described ; and I have much pleasure in associating 

 with it the name of its discoverer. It is a comparatively smooth 

 shell, characterized by the simplicity of its coloration and the uon- 

 lirate lower surface of the body-whorl. 



Cyclostoma lineatum, Pfeiffer. 



Cyclostoma lineatum, Pfeiffer, Conch. Cab. pi. 45. f. 3, 4 ; Smith, 

 P. Z. S. 1881, p. 278 (as van of C. insulare, Pfr.). 



Hah. Valley of Marohogo near Mojouga, north-west Madagascar 

 (^Johnsoii). 



The specimen from the above locality is exactly similar in all 

 respects to the type of this species, which at one time I considered 

 a variety of C insulare. As the localities prove to be different, I 

 now think it better to keep the two forms separate. Some small 

 varieties of C. insulare from the country between Lake Nyassa and 

 the east coast of Africa, referred to by me in the ' Proceedings,' 

 approach very closely the present species. None of them, however, 

 are absolutely identical, the umbilicus being a little more contracted, 

 the spire a trifle lower, and the liration around and within the 

 umbilicus decidedly coarser. In C. lineatutn this is unusually fine. 

 Pfeiffer described the shell as smooth ; but this is not correct. To 

 the unaided eye such appears to be the case ; but on making use 

 of a lens, the fine brown lines are seen to be elevated {lira), and the 

 lines of growth are by no means inconspicuous. The spiral lines 

 number about twelve on the penultimate whorl, alternately fine and 



