115 St. Maurice and Claiborne Pelecypoda 115 



For Conrad's description of /)c7;;/77/(?, see reference above cited. 



Meyer's original description of siuithi. — Solid ; irregularly elliptical ; 

 subequilateral ; with cardinal and lateral teeth ; a small but deep lunule 

 inside of a large indistinct one; surface with irregular lines of growth, be- 

 coming more regular at the extremiiies ; they are crossed ;^by very indis- 

 tinct radiating lines, margin crenulate. 



Locality- — Claiborne, Ala. 



Amongst our various collections from Claiborne we fail to 

 find any specimens with quite the comparative breadth or decid- 

 edl}- elliptical form shown by Meyer's figure (herewith copied). 

 But at Woods Bluff such is the prevailing type in the pomilia- 

 like specimens. The concentric marking is there however more 

 regular than Meyer's description would impl}-. We have fully 

 illustrated the Woods Bluff form on pi. 38. Note the general 

 si/iit/ii shape, with strong concentric raised lines tending to bunch 

 up in great folds, but in no such marked degree as shown in^^- 

 niilia and alveata from the Claiborne sand. The depth of the 

 valves, the somewhat twisted appearance of the umbones and the 

 regular liration tend to give the Sabine forms of this species a 

 Corbis-X\ks. aspect. From the St. Maurice beds of Virginia, at 

 Newcastle we find a form of this variety as shown in pi. 38, fig. 

 5. And from about the same horizon 3 miles W. N. W. of 

 Orangeburg, S. C. the rather small specimens show comparativel}" 

 stronger lirations, with beaks located even more posteriorly than 

 in any specimens herewith figured. 



Lucina pomilia Conrad, PI. 38. Figs. 6-1 1. 



For description and synonymy, see references given above. 

 Ponilia Con. (or inipressa Lea), is the name applied to the 

 Claiborne form of this stock, occupying a median ground be- 

 tween the rather smooth, dorsally characteristic carinifera and 

 the high, billowy alveata. It is certainly represented by figs. 6- 

 10 and it may include fig. 11, according to some authors. As 

 already stated, we have never collected specimens so angularly 

 developed dorsally as represented by Conrad's drawing of carin- 



