GUPPY — TERTIARY FOSSILS OF THE WEST INDIES. 160 
upper miocene fauna of Trinidad would have been much 
more limited than it is. 
Caroni Beds, Savanetta. 
Chemnitzia turn's d’Orb. Moll, de Cuba, pi. xvi. f. 10-24. 
Other forms of this species are distinguished specifically by 
d’Orbigny as C. pulcJiella y C. ornata, and C. modesta. 
These and other varieties are common in the Matura 
Beds. 
Aclis helederoides n. sp. 
Shell turreted, cylindric, many-whorled, shining, whorls 
slowly increasing, impressed with a deep groove below the 
suture, which is equally deep, forming a spiral thread ; 
aperture sub-circular, columella slightly reflexed, peristome 
simple. 
Pliocene, Matura. It resembles a Proto , but the colum- 
ella prevents its reference to that genus. I will not be sure, 
however, that it ought not to be placed in the neighborhood 
of Turritella. Its smooth texture seems to be against that 
view of its affinities. I refer it to the genus Adis provi- 
sionally only. 
Leiostraca davata n. sp. 
Shell rather club-shaped, whorls smooth, flattened, the 
last forming more than ^ ; spire acuminate, suture linear, 
scarcely impressed ; aperture suboval, elongate, narrow 
above, dilated in front ; peristome simple, columella some 
what reflected and thickened. 
Pliocene, Matura. Allied to L. acuta. 
Turritella planigyrata n. sp. 
Conic-cylindric, striate by fine spiral lines, whorls very 
slightly convex, the later ones nearly flat ; aperture sub- 
quadrate. 
