lyo Bulletin 31 170 



mam. 



Dimensions of each valve : 52 x 43 x 12 mm. 



Type. — Paleont. Mus. C. U. 



Horizon. — Claiborne Eocene. 



Speci77ien figured. — Paleont. Mus. Cornell Univ. 



Locality. — Claiborne, Ala. 



Semele linosa Conrad, PI. 52, Figs. 1-3 



Amphidesma linosa Con., Foss. Sh. Tert. Form., 1833, p. 42. 



A. linosa Con., Amer. Jr. Sci., 1846, vol, i, p. 397, pi. 4, fig. 2. 



Semele linosa Con., Amer. Jour. Conch., vol. i, 1865, p. 5. 



A. linosa Harris, Reprint. Conrad &c, 1893, pi. 19, fig, 13. 



5*. linosa Dall, Trans. Wag., Ill, 1900, p. 986. 



Conrad's best characterization (Amer. Jour. Sci.). — Ovate, plano-con- 

 vex with fine regular, concentric prominent lines ; right valve with a some- 

 what prominent obtuse fold over the umbonial slope, the base of which is 

 emarginate ; posterior side short ; extremity subtruncated or very obtusely 

 rounded, direct ; beaks slightly prominent ; fosset produced, elliptical. 



Claiborne, Alabama. 



I have only two valves of this species, which much resemble a Tell- 

 ina exteriorly. The pallial sinus is very profound. In the right valve are 

 two diverging compressed cardinal teeth, and the lateral teeth are very dis- 

 tinct. 



This occurs in the St. Maurice beds at the base of Claiborne 

 cliff and at I^isbon in connection with Tellina raveneli, some spec- 

 imens of which it resembles very closely. This is especially the 

 case when the latter become elongate and show considerable 

 areas with strongly raised, concentric lines. However, if one can 

 get at the hinge structure there need be no doubt as to which of 

 these two species a specimen should be referred. Most modern 

 Semeles have much more broadly developed and shorter internal 

 ligament than does this species. Again the external ligament is 

 unusually long in this species. 



Type. — Conradian Coll., Phila. Acad. Nat. Sci. 



The specimens here used are all from the base of the Clai- 

 borne bluff, in St. Maurice deposits, and are now deposited in 

 the Paleontological Museum at Cornell. 



Smaller, more finely striate specimens are in our collections 



