132 BUI,I.ETIN 31 133 



shows that the interspaces usually have a medially depressed 

 radiating line, while the ribs show a slight tendency medially to 

 show projections. On the rib marking off the umbonal slope 

 the projections are huge saw teeth. 



This shell seems to be the direct descendant of Aldrich's 

 hatchetigbeense of the upper Sabine of Ala. 



T)//^.— (Figs. 5, 6) Nat. Mus. Coll., Wash., D. C. 



Horizon. — St. Maurice Eocene. 



Specimeiis figured. — Paleont. Museum Cornell Univ. from 

 Lisbon, Ala. 



Localities. — Mt, Lebanon ; near Homer ; L. P. Saunders' 

 place, S. 18, 22 N., 12 W. ; near Redland, S. 19, 23 N., 12 W. ; 

 Winn Parish (S. of Marble Q'y), La. 



Walnut Bluff, Ouachita River, Ark. 



Lisbon and base of Bluff, Claiborne. 



Ft. Gaines, Ga. 



Cardlum (Trachycardium) claibornense Aid., PL 41. Figs. 8, a, 9. 



C. ( Trachy. ) claibornense Aid. These Bulletins, vol. 5, p. 3, pi, i, 

 fig. 4, lyii. 



For Aldrich^s description, see page and vol. cited. 



Type. — Aldrich Coll., Johns Hopkins Univ. 



Horizon. — Claiborne Eocene. 



Type figure herewith copied. 



Localities. — De Sota, Miss. ; Claiborne, Ala. 



Figure 9 is from a specimen in the Texas Survey materia 1 

 at Austin from Collier's Ferry, Burleson Co., Tex. It has very 

 much the general appearance of claibornense. 



Cardium ouachitense, n. sp., PI. 42. Fig. i 



Specific characterizatioji. — Left valve — the only one known — 

 very large (100 x 80 x 40 mm.), rather long, with high, proso- 

 gyrate beak ; rotund throughout, not flattened medially as in 

 harrisi ; ribs strong, rather distant, seemingly rather acute and 

 narrower than interspaces. 



