GUPPY- — MOLLTJ SKA. OP TRINIDAD. 
241 
IIelix Linne 1758. 
Terrestrial Inoperculata with discoidal, globose, convex- 
trochiform or conoidal shells ; rarely pellucid, generally 
white, brown or reddish, or variously zoned or painted 
with colors. 
The genus Helix although much restricted by recent 
writers, is still one of the largest in Zoology, containing a 
collection of species varied in shape, ornamentation and 
color, but readily recognised as belonging to one general 
type. The number of species enumerated in the 2nd edi- 
tion of Albers’ “Die Heliceen” is 1172. Some of these 
may probably be found to be only varieties ; but on the 
other hand many species are not recorded in that work. 
Until the discovery of the shells now enumerated no re- 
presentative of this genus was known to exist in Trinidad, 
Helix caeca n. sp. 
A horny brownish conic trochiform obsoletely perforate 
obliquely costulate Helix having 4 whorls a convex rather 
elevated spire with a smooth apex and a deep suture. The 
aperture is nearly circular and a little oblique, the peris- 
tome is simple and straight, its margins united by a scarce- 
ly perceptible diffuse callus on the rather ventricose body- 
whorl. The columella is somewhat effuse. Height 1 \ mill., 
breadth 2 mill., diameter of aperture 1 mill. Found on 
the trunks of trees and on mossy stones in Laventille and 
Maracas. 
This species and the one next described bear a certain 
resemblance to Helix harp a $ ay ( Zoogenetes Morse^ especi- 
ally in the character of their ornamentation. They are 
somewhat more depressed, especially II. ierensis. 
