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 j 

 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 rugattts, n. 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 trinitensis ; 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 



