SMITH : MOLLUSCA OF TRINIDAD. 239 
appear to be tenable, that is, if the shells in the British Museum 
from St. Vincent, named /vdus, are correctly determined. 
These have xo sfiral striation which is so characteristic of 
vacans, semen-lint, and cassiguiensts, all of which I believe to 
belong to one and the same species. G. “77da also is a little 
larger and less keeled at the periphery. 
i1._-Selenites alicea (Guppy). Pl. VIIL., f. 4-4b. 
fTyalinia alicea Guppy, Amer. Journ. Conch., 1870, vol. vi, 
p- 309. 
ffyalinia alicea, Crosse, Journ. de Conch., 1890, p. 39. 
Macrocycdis alicea Guppy, Journ. of Conch., vol. vi, p. 215. 
Hab.: Oropouche (Guppy). 
This species should, I think, be considered a small form of 
Selenites, rather than a Macrocyclis, a group now restricted to 
the large Chihan Ae/ix laxata Feérus. 
12.—*Epiphragmophora (Trichodiscina) coactiliata | 
(Férussac). 
Felix coactiliata, Guppy, Journ. of Conch., 1893, vol. vi., 
De 200; 
Hab : Trinidad (Guppy). 
With this species Mr. Guppy places as synonymous //. 
suturalis and H. cordovana of Pfeiffer, both of which differ in 
the absence of the colour-bands, which are so characteristic of 
Ff, coactiliata, ‘They also vary slightly in form. The specimens 
obtained by Mr. Guppy appear to have belonged to the typical 
banded torm., (Compare P-Z-s., 1875, p. 319): 
13.—Thysanophora bactricola (Guppy). Pl. VIII., f. 5—sa. 
flelix bactricola Guppy, Journ. of Conch., 1893, vol. vil., p. 216; 
Amery joum Conch) vols vi.,.ps 307 Pl) uy vt 5 
Hab.: Also Venezuelan Guiana (Crosse). 
14.—Thysanophora fuscula (C. B. Adams). 
Flehix plaxtoptycha Shuttleworth. 
*Species marked with an asterisk have not been seen by the writer from Trinidad. 
