155 St. Maurice and Claiborne Pelecypoda 155 



Claiborne sand at Claiborne, Ala. Burns. 



This species is readily recognized by its peculiar surface. It is most 

 surprisingly like that shown for Panopea clongafa (Md. Geol. Surv. Eocene, 

 pi. XXXI, 'fig. 2 a. (Harris) 



So far as we are aware Ball's tjpe is the onl)^ specimen 

 known. It is in the U. S. Nat. Museum. 



Psammobia biainvillei L,ea, PI. 48, Fig. 6 



Solecurtus Blainvillii L,ea, Cont. to Geol., 1833, p. 39, pi. r, fig. 7. 

 Psammobia Biainvillei Dall, Trans. Wag., Ill, 1900, p. 959. 



Lea's original description. — Shell trapezoidal, rather compressed, 

 nearly equilateral, transversely and minutely striate, truncate behind ; 

 beaks very small ; escutcheon long and deeply impressed ; teeth two, the 

 anterior one large and erect, the posterior small and oblique ; margin en- 

 tire. 



Diam Length .8, Breadth 1.3, inches. • 



We have seen no other specimen of this species but the t3'pe 

 in the Phila. Academy's Collection, No. 5021. It came from 

 the "sand bed" at Claiborne, Ala. 



Psammobia filosa Conrad, PI. 48, Fg. 7. 



P.filosa Coil., Foss. Sh. Tert. Form, 1833, p. 42. 

 Gari filosa Con., Amer. Jr. Conch., vol, i, 1865, p. 4. 

 P.filosa Dall, Trans. Wag., Ill, 1900, pp. 976 and 977. 



Conrad's original description. — Shell elongate, with concentric acute 

 strise, very prominent on the smaller side, which is narrowed and subangu- 

 lated at the end ; beaks not prominent ; anterior dorsal margin straight, 

 and the end obtusely rounded ; basal margin straight. 



Dall says of this species : P. filosa Conrad belongs to the section 

 Garum of the typical Psammobias. It is elongate and somewhat arcuate ; 

 the concentric sculpture pretty close and uniform on the disk, but elevated 

 into low, somewhat broken small laminae on the posterior dorsal slope ; the 

 type is forty-two millimetres long and about fifteen millimetres high. The 

 teeth and pallial sinus are as in Garum. 



On the same card with Conrad's t3'pe in the collection of the Academy 

 of Natural Sciences is another shell thirty-nine millimetres long and seven- 

 teen millimetres high, more equilateral, less arcuate, with a blunter and 

 less decurved posterior end and generall}' straighter dorsal margin. This 

 is probably a distinct species for which I would propose the name of Psam- 

 mobia {Garum) claibornensis. 



The figure herewith given is from a rough pencil .sketch of 



