A36 Mr. R. J. L. Guppy on the Terrestrial 
ever, that, in view of their affinities, the name Conuwlus is the 
proper one for the group. The name Stenopus cannot be 
allowed to stand, having been preoccupied for a crustacean. 
Such shells as Conulus semen-lint and C. Gundlachi are evi- 
dently not separable from the present group. The mucus- 
pore and retractile appendage on the truncate tail are found in 
the genus Nanina and also in Zonites (as restricted in‘ Die 
Heliceen’ of Albers) ; and Conulus vacans has also the median 
part of the foot defined as in Nanina (e.g. Helicarion Frey- 
cinett). I think, therefore, that the best classification will be 
to refer to Zonites all those species (of the group now under 
consideration) in which a caudal appendage exists. Conulus 
will thus form a section of Zonites comprising the minutely 
perforated trochiform species. To the group 4gopis will be 
assigned those species having shells like Stenopus cruentatus, 
Guild., S. Gudldingi, Bland, and Helix nitensoides, D’Orb. 
The genus Hyalina will then consist of the species, such as 
H, cellaria and H. nitens, which have no caudal appendage. 
3. Helix diminuta, C. B. Adams. 
4. Helix perplexa, Fér. 
I did not collect this species myself; but I have received 
examples of it from a former Governor of Grenada, His Ex- 
— cellency Mr. Keate. 
5. Plekocheilus glaber, Gmelin. 
var. grenadensis. | 
This differs from the Trinidad shell described by me as P. 
auris-sciurt in its greater solidity and more ventricose figure, 
and in being less impressed in the middle of the last whorl. 
Its lip is thicker, and its columellar tooth more prominent. 
In all these respects, Spek the compression of the a whorl, 
it agrees better with the Brazilian P. glaber than the Trinidad 
form does. 
6. Bulimulus indistinctus, n. sp. 
Testa subperforata, tenuis, oblongo-conica, ventricosa, pallido- 
brunnea vel lutescens; anfr. 6, regulariter accrescentes, ultimus 
ventricosus, 2 teste longitudinis equans; spira conica, apex 
acuminatus ; apertura oblongo-ovalis ; peristoma simplex, acutum, 
haud expansum; margine columellari reflexo. 
Long. 23 millim., lat. 12; aperture long. 11, lat. 6. 
Shell subperforate, somewhat thin, oblong-conic, rather 
ventricose, pale reddish brown or inclining to yellowish white; 
whorls 6, gradually increasing, the last somewhat ventricose, 
equal to about two-thirds of the length of the shell; spire 
