154 Bulletin 31 154 



concentric folds and intermittent or discontinuous radial costa- 

 tion most clearly visible anteriorly ; interior with a deep, loop- 

 shaped ascending pallial sinus ; muscular scars large but indis- 

 tinct ; tooth in the left valve (the only specimen known) well- 

 defined, but probably broken. 



This rare species is known from one specimen only, loaned 

 from the U. S. National Museum Collection. From the Clai- 

 borne sand, Alabama. 



Trapezium claibornense Dall, PI. 48, Figs. 3, 4 



T. claiborneHse Ball, Trans. Wag., Ill, p. 1498, pi. 43, figs. 9, 10. 

 Figure published in 1900, description 1903. 



DalVs original description. — Shell small, subquadrate, subcom- 

 pressed, inequilateral, with low, pointed beaks at the anterior third ; anter- 

 ior end rounded and rather attenuated, the posterior broad and subtruncate; 

 disk covered with rather close, rounded concentric ribbing, obsolete on the 

 umbones ; hinge feeble, the teeth imperfectly developed, the cardinals ob- 

 scure and the lateral feeble ; the pallial line entire. Length 7.0, height 

 4.5, diameter 2.0 mm. 



This shell is evidently 3'oung and only the left valve was obtained. 

 It is, however, evidently a Trapezium and of interest as showing the pres- 

 ence of that genus in the Claiborne sands. 



Unfortunately the only valve we possess is also the left. 



Type.--\}. S. Nat. Mus. 



Horizon. — Claiborne Eocene. 



Specimen figured. — Paleont. Mus. Cornell Univ. 



Locality. — Claiborne, Ala. 



Coralliophaga (Oryctomya) claibornensis Dall, PI. 48, Fig. 5, a 



C. {Oryctomya) claibornensis Dall, Nautilus, '98, vol. 11, p. 135. Also 

 Trans. Wag., vol. Ill, 1898, p. 929, pi. 34, figs. 16, a. 



Dallas original description. — Shell elongate with oval low beaks, quite an- 

 terior, moderately inflated, somewhat mesially impressed ; surface with in- 

 cremental lines which in senile specimens sometimes becomes lamellose 

 near the posterior end ; radial sculpture of rows of small globular granules 

 easily worn off and almost microscopic ; ends rounded, the posterior broad- 

 er ; hinge teeth delicate, somewhat pedunculate and slender in the adult 

 pallial sinus not extending in front of the posterior adductor scar ; pallial 

 line in senile specimens radially striated. 



Lon. 36, alt. 19, diam, 14 mm. 



