200 PROCEEDINGS OF THE ACADEMY OF [April, 



Length 26, alt. 21.6, semidiameter 8.2 mm. 

 Type a right valve. No. 2782, A. N. S. P. 



Cyclinella cyclica domingensis n- subsp. 



Cyclina cyclica Guppy, Gabb, Trans. Amer. Philos. Soc, XV, p. 250. 

 ? Dosinia cyclica Guppy, Q. J. Geol. Soc, XXII, 1866, p. 582, PI. 26, figs. 

 15a, h. 



According to Guppy, the lunule is entirely wanting in his species, 

 but Dall, who has examined the types, states that it is large and 

 lanceolate, and there is "a close concentric sculpture of fine, sharp, 

 somewhat elevated lines" (Wagn. Trans. Ill, 1285). In the Santo 

 Domingo specimen (No. 2755), an excessively faint impressed line 

 defines the lunule, which is about 7 mm. long, 3 wide. The sculp- 

 ture consists of unequal, unevenly developed flat growth-ripples, 

 which on the posterior dorsal slope become fine but not much elevated 

 threads. 



Length 28.7, alt. 26.5, diam. 14 mm. 



As the single specimen seems to differ somewhat from the account 

 of Guppy's species, we prefer to treat it as a variety. 



Dall stated that the type of D. cyclica Guppy was a Liicino'psis 

 {Proc. U. S. N, Mus., XIX, 329), but later {Trans. Wagn. Inst., Ill, 

 1285) he placed it in Cyclinella. 



Type No. 2755. 



Dosinia azuana n. sp. 



The shell resembles D. elegans, but is somewhat plumper, with the 

 concentric grooves more widely spaced, strong throughout. The 

 sculpture is not laminar at the ends. Lunule as in D. elegans. 



Length 39, alt. 38, diam. 20 mm. 



West of Azua, collected by Mr. L. B. Smith. 



Type No. 2685, A. N. S. P. 



Semele delimata «. sp. 



The shell is compressed with small, inconspicuous l)eaks near the 

 middle, lunule rather deep. Anterior end broadly rounded, posterior 

 end more produced and narrower. There are rather sharjD growth- 

 striae near the lower margin, elsewhere smooth. 



Length 47, alt. 38.5, diam. 20.5 mm. 



It is related to S. silicata Dall, a smaller, more sharply sculptured 

 species. 

 Semele firma n. sp. 



Closely related to S. sardonica Dall, but of a less wide, ovate out- 

 ine; lunule deep and narrow; escutcheon narrow, about equally 



