46 Mr. R. J. L. Guppy on the Terrestrial and 
of the tentacles ; the head is prolonged into an obtuse undivided 
muzzle, which scarcely extends forward beyond the foot; the ¢ 
organ is large and subulate, situate medially on the back of the 
neck. The animal resembles generally Cyclophorus, and not 
Cyclostoma*. 
The animal of C. rugatus does not differ remarkably from the 
preceding ; and I feel confident that the animals of the allied 
West-Indian and American forms will be found on examination 
to be similar also. The lingual dentition fully bears out these 
remarks. The teeth of the Cyclophoride are 3.1.8, while 
those of the Cyclostomide are 2.1.2 or 00.2.1.2.00. The 
Trinidad Cycloti have the former dentition. 
From these considerations I do not think it probable that, 
in the present state of our knowledge, a new genus need be 
constituted for theAmerican (including the West-Indian) species. 
Cyclotus translucidus, Sow., sp. 
C. trinitensis, Guppy, Ann. & Mag. Nat. Hist. ser. 3. vol. xiv. p. 245. 
Though I was at first led to consider the Trinidad shell to be 
distinct, I am now of opinion that it cannot be separated from 
the Venezuélan species. 
This and the following species are found among dead leaves 
in forests, on calcareous soils. 
Cyclotus rugatus, Guppy. 
(Ann. & Mag. Nat. Hist. ser. 3. vol. xiv. p. 246.) 
This shell is closely allied to C. stramineus, Reeve, from which 
it is readily to be distinguished by the fine fold-like striz being 
oblique and rising diagonally forward in C. stramineus. These 
striz are also continued to the aperture in that species; but in 
C. rugatus the striz run in zigzags, and coincide in general 
direction with the lines of growth, resembling in this respect 
the Jamaica species C. corrugatus and C.jamaicensis. C. rugatus 
is distinguished from these latter forms by its general shape and 
by the absence of any ridge round the umbilicus. In C. rugatus 
the angularly wrinkled strize become nearly obsolete at the 
aperture. C'. stramineus has a spire of half a whorl more than 
C. rugatus. Again, specimens of the latter shell are generally 
easily distinguished by their dark reddish-brown colour. 
Henicina, Lamarck. 
Helicina nemoralis, Guppy. 
Helicina zonata, Guppy, Aun. & Mag. Nat. Hist. ser. 3. vol. xiv. p. 247. 
This shell is very like H. jamaicensis, from which it may most 
* D’Orbigny has given figures of the animal of C. inca (Voy. Amér. 
Mérid. Mollusques, pl. 46. figs. 21-23). The figure given by Chenu (Man. 
de Conch. vol. i. p. 2. f. 11) is probably copied from D’Orbigny, and also 
that in Mrs. Gray’s ‘ Figures of Mollusca.’ 
