178 PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION. 
orbicular in shape. There is also some likeness between our 
shell and Anatina globulosa Lam. 
2. Lithodomus kipenniferus Guppy (PI. vii., f. 14). 
L. bipenniferus Guppy, Proc. Scient. Assoc. Trinidad, 
1877, p. 155. 
Described in my list of Molluska from the Gulf of Paria. 
Several species of Lithodomus have been described from the 
Westindies ; but none that I know of possessing the peculiar 
characters of this shell, which appears to be most nearly 
allied to the L. caudigerus of West Africa. It is found in 
almost every piece of limestone and coral in the Gulf. 
3. Metula lintea n. sp. (PI. vii., f. 18). 
Regularly fusiform, imperforate, cancellated by longitudinal 
and revolving lines — the latter stronger on the lower whorls, 
the longitudinal ones more evident above ; spire-turreted, 
whorls eight, gradually increasing, slightly convex, the first 
two smooth, the last forming more than two-thirds of the 
shell ; suture subcrenate, bordered, aperture elongate ; colu- 
mella truncate, simple or slightly twisted, covered with a 
thin callus spread along the body-whorl to the outer lip, 
which is thin and sharp, thickening backwards into a varici- 
form ridge. Length 27 mill., breadth 10 mill. 
Dredged by Mr. W. 0. Crosby in the Gulf of Paria. 
Allied to M. cancellata Gabb, of the Miocene of Haiti and 
Jamaica. Our single specimen is distinguished from M. can- 
cellata by its very much finer ornamentation, and by the 
absence of varices ; tbe thickening near the mouth showing 
only the incipient existence of the variciform tendency. 
4. Pleurotoma miranda n. sp. (PI. vii., f. 19 * 
Fusiform turreted, whorls about eight, angulated, narrow- 
