197 St, Maurice and Claiborne Pelecypoda 197 



7>/>^.— The Texas State Mus. Coll. 



Horizon. — St. Maurice Eocene. 



Locality. — Two miles east of xMto, Cherokee Co., Te 



Phladomya claibornensis Aldrich, PL 59, Figs. 6-10 



P. claibornensis Kldi., Geol. Surv. Ala., Bull, i, 1886, p. 38, pi. 4, 



fig. 5- 

 P. claibornensis Dall, Trans. Wag.. Ill, 1903, p. 1531. 



Aldrich' s original description.— ^\i.^\\. exceedingly thin, pearly, con- 

 centrically ribbed, crossed by radial lines, which are strong on the um- 

 bones ; beak high, very prominent close to the anterior end of the shell, 

 anterior truncated abruptly ; posterier produced, flattened on the upper 

 part ; lunule long and narrow, smooth ; hinge raised, prominent. 



This shell, as already pointed out by Dall, assumes verj^ dif- 

 ferent aspects in accordances with the pressure it has been sub- 

 jected to in the enclosing beds. Perhaps we get the best concep- 

 tion of its form in specimens preserved in hard, clay ironstone as 

 at St. Maurice, La. , where it is quite abundant. 



Type. — Aldrich Coll., Johns Hopkins Univ. 



Horizon. — St. Maurice Eocene. 



Specimens figured. — Texas State Museum, No. 452 and 

 Cornell Univ. 



Localities. — Texas iTheree miles N. E. of Crockett, Rusk 

 Road, Houston Co. ; two miles E. of Alto, Cherokee Co. Louis- 

 iana : St. Maurice, mouth of Saline Bayou. Alabama : base of 

 of bluff, Claiborne ; Lisbon. 



Gastroceaena larva Conrad, PI- 59, Figs, n, 12 



Fistulana larva Con., Amer. Jr. Sci., vol. i, 1846, p. 212, pi. i, fig. 5. 

 Gastrochcsna larva Con., Amer. Jour. Conch., vol. r, 1865, p. 2. 

 Gastrochcena larva Aid., These Bulletins, vol. i, 1885, p. 71, pi. 6, 

 fig. 12. 



Conrad's original descriptio7i. — Ovate-oblong, ventricose ; thin 

 and fragile ; anterior margin short, straight, very oblique ; extremity an- 

 gulated ; posterior margin regularly rounded ; umbonial slope defined by 

 impressed lines ; concentric lines on the anterior half of the shell rough 



