179 St. Maurice and Claiborne Pelecypoda i79 



Astarte conradi Dana, Man'l Geol., 1863, p. 516. fit;. 800. 



Lutraria conradi Aid., Bull, i, Geol. Surv. Ala., 1S86, 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 hy Prof. Dana hasbeen con- 

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

 prin, who considered it a yom\<g Crassatella alta. 



While writing my Texas MS report on the Tertiaries of 

 that State I had the opportunitj^ of comparing the type of P. 

 cofiradi with lapidosa and found that they most probably were 

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

 hesitatingly^ 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 tj'pes are la- 

 belled petrosa instead of lapidosa. 



Type. — Philadelphia Academy, Nat. Sci. 



Horizoyi. — St. Maurice Eocene. 



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

 in Paleont. Laboratorj', Cornell Univ. 



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

 Co. La. : 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. 



