246 Mr.R.J. L. Guppy on new Species of Fluviatile and 
bilicus. It is not a common shell on the main island of Trinidad ; 
but it is found in abundance on one of the rocky islets of the 
group called the Coloras, or Five Islands, in the Gulf of Paria. 
In aged examples the epidermis is frequently quite wanting, 
and the aperture is much thickened and wrinkled. 
Cyclotus rugatus, 0. sp. 
Shell depressed-turbinate, with a strong reddish-brown epider- 
mis, zoned with several narrow, obsolete lighter bands, and 
closely covered with fine angular wrinkles, which almost dis- 
appear at the aperture; spire short, depressed ; whorls 4, 
rather flattened above, convex and rounded beneath; umbi- 
licus broadly open; aperture nearly vertical, circular, with a 
slight angle above; peristome straight, blunt, its margins 
joined into an angle, right margin not sinuate. Operculum 
testaceous, and concave externally, internally cartilaginous, 
with about seven narrow obliquely striated whorls, the inner 
margins of which are raised. Height 0-4 inch, greatest 
breadth 0°7 inch. 
The animal of C. rugatus is of a pink colour, strongest about 
the tentacles. The lingual teeth do not present any remarkable 
differences from those of C. trinitensis, except that the outer 
laterals are bidentate (not tridentate), thus more closely ap- 
proaching Cyclophorus Tuba. 
This very distinct species is found among the northern hills 
of Trinidad, ranging to an altitude of 2500 feet. It has fewer 
whorls, a much more depressed spire, and an operculum with 
narrower and more numerous whorls than C. ¢rinitensis ; and 
in the angularly wrinkled character of its epidermis it approaches 
C. corrugatus. 
Adamsiella aripensis, n. sp. 
Shell oblong-turreted, narrowly perforate, scarcely truncate, 
rather thin, crowdedly folded longitudinally, dark reddish 
brown, often with several darker interrupted bands, and about 
three spiral ridges round the narrow umbilicus; spire regu- 
larly tapering, scarcely truncate ; suture deep, simple; whorls 
remaining 6, convex, enlarging gradually; aperture vertical, 
ovate ; peristome orange or pale, double, concentrically striate, 
dilated above; inner edge waved, rather emarginate on the 
penultimate whorl; outer edge slightly waved. Operculum 
ovate, rather cartilaginous, with about four gradually en- 
larging whorls, the outer edge of which is detached. Length 
0-65 inch, greatest breadth 0°3 inch. 
This handsome species is found on the Cerros of Aripo, in 
the northern hills of Trinidad, at an elevation of from 2000 to 
