378 MR. E. A. SMITH ON THE [Apr. 18, 
has five or six lines on the penultimate whorl, and is a more elevated 
shell than C. consanguineum (= obsoletum, Rve.), in both these 
respects agreeing very well with C. madagascariense of Gray, which 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 lire, the penultimate with 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 umbilicus. 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 133; aperture 8 long, 63 
wide. 
Hab. South of Trabonjy, north-west central part of Madagascar 
(Johnson). 
This very interesting species is not likely to be confounded with 
any previously 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 non- 
lirate lower surface of the body-whorl. : 
CycLOsTOMA LINEATUM, Pfeiffer. 
Cyclostoma lineatum, Pfeiffer, Conch. Cab. pl. 45. f. 3,4 ; Smith, 
P. Z.S. 1881, p. 278 (as var. of O. insulare, Pfr.). 
Hab. Valley of Marohogo near Mojonga, north-west Madagascar 
(Johnson). 
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 CU. 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. lineatum 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 (dire), and the 
lines of growth are by no means iticonspicuous. The spiral lines 
number about twelve on the penultimate whorl, alternately fine and 
