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orbicular in shape. There is also some likeness between our 

 shell and Anatina globulosa Lam. 



2. Lithodomus bipennifems Guppy (PL vii., f. 14). 

 L. bipenniferous Guppy, Proc. Scient. Assoc. Trinidad, 

 i§77> 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. O. 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 ; the thickening near the mouth showing 

 only the incipient existence of the variciform tendency. 



4. Pleurotoma mirandan. sp. (PI. vii., f. 19). 

 Fusiform turreted, whorls about eight, angulated, narrow- 



