88 BUI.LETIN 31 88 



signs of terracing, and the teeth are not in accord with those of 

 the young oi planicosta. Especially peculiar is the anterior card- 

 inal in the left valve, which is not triangular, with a general 

 slope toward the center of the shell, but of a more slender build 

 sloping anteriorly at base. This feature together with the de- 

 velopment of laterals make this an interesting form. It differs 

 externall}' ixova parva by its smaller size, more quadrate form and 

 fewer ribs (scarcely one-half the number of that .species). 



Type, etc. — Paleont. Mus. Cornell Univ. 



Locality. — Lisbon and Claiborne, Ala. (Very rare) . 



Venericardia parva Lea, PI. 31. Figs. 13-16. 



V. parva Lea, Cont. to Geol., 1833, p. 70, pi. 2, fig. 49. 



Cardita {Ven.) transversa vox. juvenis de Greg., Mon. Faun. Eoc. 



Ala., 1890, pi. 31, figs. 14-22. 

 V. {Pleuroineris) parva Dall, Trans. Wag., Ill, 1903, p. 1432. 



Lea's original description. — Shell subtriangular, rounded below, an- 

 gular above, inflated, inequilateral, longitudinally and closely ribbed ; sub- 

 stance of the shell thick, lunule large, cordate, slightly impressed ; beaks 

 elevated, large ; ribs about twenty, transversely and thickly crenulate, teeth 

 oblique ; cicatrices slightly impressed ; cavity of the shell rather deep 

 margin largely crenulate. 



Diam. 2, Length .3, Breadth .3 of an inch. 



rj;/)^.— Probably Nos. 5285,5286 of the Lea Coll., Phila. 

 Acad., though the specimens are somewhat small. 



Horizon. — Claiborne and St. Maurice. 



Speci^nens figured. — Claiborne sand. Paleont. Mus. Cor- 

 nell Univ. 



Localities. — Claiborne sand and base of bluff. 



"A variety (which may be called synnuietrica) of this shell occurs 

 both in the Claibornian and Jacksonian, but appears to be very rare. It 

 resembles the ordinary form in every way except that the beaks are erect 

 and central, the dorsal slopes similar and the resulting form of the shell a 

 very regular oval. At first glance this seems very distinct." — Dall. Trans. 

 Wag., Ill, 1903, p. 1432. 



So far we have found no specimens that seem referable 

 to Ball's variety symmetrica. 



