Terrestrial Operculate Mollusca from Trinidad. 247 
2700 feet. The animal has a rather elongate grooved foot. 
Lingual teeth 00.2.1.2.00: central tooth broad, simple; inner 
lateral broad; outer lateral broad, denticulated on the reflexed 
edge; uncini numerous, slender, curved at the tip. The lingual 
dentition is thus shown to differ considerably from that of Cyclo- 
phorus. While the central and lateral teeth present a certain 
resemblance to those of Cyclophorus, the uncini remind one of 
Trochus, Nerita, and especially Helicina. The teeth of Adam- 
siella aripensis also resemble those of Cistula pupiformis, which 
I have examined ; but in the latter there are no uncini. 
The shell of the present species is occasionally found without 
its spire having suffered the usual slight truncation. 
Helicina zonata, n. sp. 
Shell subglobose-conic, thin, smooth, whitish, bright straw- 
coloured or pinkish ; suture with a chestnut or red band which 
becomes quite obsolete on the last whorl, and sometimes a 
broader yellow or pinkish band on the last whorl; spire conic, 
mucronate ; apex deep red ; whorls 5, convex, rather carinate, 
flattened beneath; aperture oblique; columella terminating 
im an indistinct knot dilated backwards into a thin circum- 
scribed callus; peristome thin, white, expanded and reflected. 
Operculum rather shelly, deep blood-red, except at the nu- 
cleus and extreme margin, which are horn-coloured diapha- 
nous. Height 0°27 inch, greatest breadth 0°42 inch. 
Lingual teeth 00.3.1.3.00: central subquadrate, narrowed at 
the base; Ist lateral subopaque, subtrapeziform, with the outer 
corner much produced ; 2nd lateral subopaque, elongate, strongly 
curved outwardly ; 3rd lateral broad, convex, glossy, denticulate 
on the reflexed edge; uncini numerous, slender, with the curved 
tips finely denticulate. The peculiarities of the lmgual dentition 
of Helicina would seem to have been overlooked. The numerous 
uncini and the subopaque trapeziform laterals remind us strongly 
of Nerita, and would seem to give some support to the idea of 
the close relationship of these genera—an idea which is further 
supported by the resemblance of the shells of the two genera. 
Helicina barbata, nu. sp. 
Shell globose-turbinate, thin, smooth, zoned with about three 
chestnut or red bands, covered with a hairy periostraca ; spire 
depressed-conic ; whorls 5, convex, flattened beneath; aper- 
ture oblique, semilunar; columella terminating in an indis- 
tinct knot dilated backwards into a thin callus; peristome 
narrowly expanded; right margin slightly sinuate above. 
Operculum thin, concave, pale, diaphanous, blood-red towards 
