179 St. Maurice and Claiborne Pelecypoda 179 



Astarte conradi Dana, Man'l Geol., 1863, p. 516. fig. Soo. 



Lutraria conradi Aid., Bull, i, Geol. Surv. Ala., i8S6, p. 39, pi. 4, 



fiR- 7- 

 Pteropsis lapidosa Dall, Trans. Wag., Ill, 1895, p. 881. 



Conrad'' s description. — Obliquely ovate, convex, with rather distinct 

 large concentric sulci, obsolete towards the base ; summits very elevated, 

 from which the anterior and posterior dorsal margins decline very oblique- 

 iy ; anterior extremity -angulated ; posterior side cuneiform towards the end 

 margin, which is acutely rounded or subangulated ; anterior basal margin 

 very oblique, subtruncated. Orangeburg, S. C. 



I have but one specimen, a cast in indurated clay, without a trace of 

 the original shell remaining upon it. 



This species possesses a very thin, fragile shell, and, when 

 embedded in marly clay is apt to be much distorted. As Aid- 

 rich says (loc. cit) : The one fiugred by Prof. Dana has been con- 

 siderably distorted by pressure, and therefore mislead Prof. Heil- 

 prin, who considered it a young Crassatella alta. 



While writing my Texas MS report on the Tertiaries of 

 that State I had the opportunity of comparing the type of P. 

 conradi with lapidosa and found that they most probably were 

 of one and the same species, as Aldrich had intimated. Dall un- 

 hesitatingh^ refers conradi to lapidosa. In this he is doubtless 

 correct. Conrad's type and description of lapidosa are incom- 

 plete in lacking the pouting lunular area. Distortion causes 

 the shell to assume all sorts of outline. Strangely enough, prob- 

 ably through a mental confusion, the Philadelphia types are la- 

 belled petrosa instead of lapidosa. 



Type. — Philadelphia Academy, Nat. Sci. 



Horizo7i. — St. Maurice Eocene. 



Specimen figured. — Orangeburg District, S. C. Specimen 

 inPaleont. I^aborator}-, Cornell Univ. 



Localities. — Texas : Campbell's and Cedar Creek, Robertson 

 Co. L,a. : Near Red Land, Bossier Parish ; Gibsland ; Chau- 

 tauqua ; Hammett's Branch. Miss. : 4 miles W. of Enterprise ; 

 Wautubbee. Ala. : Coffeeville, Lisbon, base of Claiborne 

 Bluff. S. C. : Orangeburg District ; Center Hill. 



