68 Bulletin 31 



size and terminating conspicuously almost at the margin between 

 the siphons. 



Length 7.3 mm. Height 4 mm. Serai-diameter 1.5 mm. 



Type. — U. S. Nat. Museum, Sta "4589" Kitts Ravine, Cal- 

 houn Co., S. C. 



Leda crassiparva, n. sp., PI. 25, Figs. 7-9. 



Specific characterizatio7i. — Size and general form as indicated 

 by the figures ; substance of the shell thick ; surface appearing 

 smooth except in the post-basal region ; radiating post-umbonal 

 depression extending from beak to point on the basal margin 

 somewhat in advance of the posterior termination or beak ; lun- 

 ule faintly indicated b}' depressed lines ; escutcheon defined by 

 the usual curved middle rib (fig. 8); eminence between siphons 

 small, hemispherical. 



This little shell .seems at first closely allied to the slightly 

 larger L. catasarca Dall from Wautubbee. But it lacks the band- 

 ed surface markings of that species, and the radiating, post-um- 

 bonal channel terminates quite differently in the two species. 

 Specimens in Aldrich's collection (fig. 9) show that in general the 

 shell is somewhat longer than the type (figs. 7, 8). 



Type. — Paleont. Mus. Cornell Univ. 



Horizon. — St. Maurice Eocene. 



Specimens figured. — Figs. 7, 8, Cornell Univ.; Fig. 9, Aid- 

 rich Coll. 



Locality. — Lisbon, Ala. 



Conrad's linifera from the Jackson beds of Mississippi and 

 Ball's canonica as well as his var. chipolana Trans. Wag. Ill, p. 

 591, seem to be descendants of this species, but real relationships 

 seem impossible to establish without more and better figures of 

 the later forms. The latter seem to be only of about one-half the 

 linear dimensions of crassiparva. 



Ledaozarkola, n. sp.. Fig. 25. Figs. 10-14. 



Specific characterization.. — Size and general appearance as in- 

 dicated by the illustrations and explanations ; extremely inflated 



