Mollusca of Dominica. 435 
being more keeled, by its pubescence, and by its basal callus 
and columellar knot. 
19. Helicina rhodostoma, Gray. 
A handsome species, variable as to colour, often nearly 
white. The expanded peristome varies from white, through 
orange and red, to a deep chestnut. The operculum of all my 
specimens is large, thin, and horn-coloured. ‘The spine at the 
base of the columella is also of variable length, and sometimes 
it is obsolete. | 
20. Helicina conuloides, n. sp. 
Testa conica, trochiformis, tenuis, levis, nitens, diaphana, rubro- 
brunnea; spira conica, elevata; apex acuminatus; anfr. 6, vix 
conyexi; apertura leviter obliqua; peristoma tenue, rectum ; co- 
_ lumella in callum albidum et circumscriptum dilatata. 
Alt. 4 millim., lat. 5. 
Operculum tenue, diaphanum, margine interno paulo incrassato. 
A conic-trochiform, thin, smooth, shining, diaphanous, 
reddish-brown Helicina, with an elevated conic spire and a 
pointed apex; whorls 6, scarcely convex; aperture slightly 
oblique; peristome thin, straight; columella dilated into a 
whitish, rather circumscribed, not very large callus. Oper- 
culum thin, diaphanous, somewhat thickened on the inner 
margin. 
Allied to H. trochulina, D’Orb. (Moll. de Cuba, tab. 20. 
f. 10-12). It differs in being scarcely so high relatively, in 
its more pyramidal form, and its thinner peristome, which is 
not expanded; its colour, also, is reddish brown, instead of 
yellow. One of my examples was furnished with two oper- 
cula. I have named the species from its great resemblance, in 
colour, shape, and texture, to the shells of the subgenus Co- 
nulus of Zonites. 
Part I. GRENADA. 
1. Veronicella levis, Fér. 
Vaginulus Sloanet, Fér. (Guppy). 
2. Conulus vacans, Guppy. 
It has been suggested to me that this mollusk, which I 
described as occurring in Trinidad, is possibly the.same as 
Stenopus lividus of Guilding. I had, however, made a careful 
comparison of Guilding’s figure, and it seemed to me that the 
two were distinct, although there can be little doubt that both 
mollusks belong to the same group. I venture to think, how- 
