198 PROCEEDINGS OF THE ACADEMY OF [April, 



resembling Codakia {Jagonia) antillarum (Rve.) Gabb's specimen, 

 No. 3324 A. N. S. P., a single valve, is not identical with Codakia 

 vendryesi, as Dr. Dall supposed. 



Phiacoides (Parvilucina) pupulus n. sp. 



Lucina crenulata Con., Gabb, Trans. Amer. Philos. Soc, XV, p. 251. 



This is a species of the crenidata group, differing from the type of 

 crenulata Conr. (No. 2718, A. N. S. P.) by its far smaller size, thinner 

 concentric lamelliB and the relatively coarser, low and rounded radial 

 sculpture, which appears much more prominent when the concentric 

 lamellse are worn off. The lunule is relatively larger, very deep; 

 finally the teeth are heavier and the marginal crenulation coarser 

 for the size. 



Length 2.8, alt. 2.7, diam. of one valve 1.05 mm. 



Type No. 3323, A. N. S. P., with five other valves. 



Divaricella proletaria n. sp. 



Lucina denlata Wood, Gabb, Trans. Amer. Philos. Soc, XV, p. 251. 



The shell is thin, plump, subcircular, equilateral, with sculpture of 

 the usual Divaricella pattern, the grooves widely spaced for so small 

 a shell. There are several strongly marked grooves of growth-arrest 

 in large specimens. The inner margin is finely crenvilated, the 

 hinge-line strongly arched, and not angular at the ends. 



Length 8.75, alt. 8.25, diam. of one valve 3 mm. 



Type No. 2754, A. N. S. P. 



This species is represented by over 20 valves. It is related to 

 D. quadrisulcata (Orb.), but differs by the much smaller size, plumper 

 form, far more curved hinge-line, and the relatively coarser sculpture. 



Lucina mauryae n. sp. 



The shell is compressed, the diameter about half the length, 

 orbicular, with the small beaks near the anterior third of the length. 

 In front of the beaks the shell is produced in a thin wing. There is a 

 small lunule defined by a groove in the right valve, none in the left. 

 The dorsal area is defined by a slight furrow in both valves; surface 

 delicately striate concentrically. 



Length 36.5, alt. 33.5, diam. 19 mm. 



The valves are sl few millimeters apart at the lower edge; if in 

 contact the diameter would be at least 1 mm. less. The compressed 

 shape is characteristic. 

 Diplodonta dedecoris n. sp. 



The shell is thin, with Bather small, pointed beaks, and incon- 

 spicuous sculpture of fine, irregularly developed concentric striae, 



