l6 BULLETI>^ 31 16 



The number of plications varies greatly, see pi. 10. 



This species seems to have a very limited range, from Cnne- 

 cah River, Ala., to Newton, Miss. 



Type. — Aldrich Coll. (Johns Hojikins Univ. Mns.) 



Horizon. — St. Maurice. 



Specimen figured. — Cornell Univ. Mus. (11- 13, Caton's 

 Bluff ; 15, Lisbon. Ala.) 



Localities. — Claiborne, Lisbon, Newton, (fide Aid.) al.so at 

 Caton's Bluff, Conecuh River, Ala. 



Anomia ephippioides PI. n. Figs. 1-3. 



A. ephippioides Gabh, Ja.Phila. Acad. Nat. Sci., 2d Ser., vol. 4, i860, 



p. 388, pi. 67, fig. 59. 

 A. ephippioides Dall, Trans. Wag. &c., vol. 3, 1S9S. p. 782. 

 Gabb's original description. — "Very irregularly sub-quadrate, some- 

 times \*ery nearly circular, sometimes almost triangular ; convex, occasion- 

 ally marked by longitudinal rugte, and always by distinct lines of growth ; 

 lower valve, the muscular foramen large, ligament margin thickened. 

 Size of largest specimen: Length 1.5 in., width 1.3 in." 



This species in a general way resembles,-:/, simplex oi our 

 coast (sometimes called A. ephippium, hence Gabb's name). 

 Specimens when well preserved .show a peculiar postulose exter- 

 ior, the pustules in .some instances becoming elongated. 



Although Gabb's tj-pes are .suppo-sed to be in the Phila. 

 Academj^'s collection none there show the "lower valve." This 

 with a larger form usually referred to lisboncnsis occurs in great 

 abundance from the Rio Grande to the vSabine almo.st wherever 

 the St. Maurice beds are represented. 



Although specimens of .^;/^/;/ /a are abundant in the Lower 

 Claiborne (St. Maurice) of Louisiana, the pustulate type becomes 

 rare and the generallj- larger, smooth lisbonensis predominates. 



7>/^.— Phila. Acad. Nat. Sci. 



Horizon. — St. Maurice Eocene. 



Specimens figured. — Cornell Univ. Mus. 

 Localities. — From 13 mis below Laredo, northeastward through- 

 out Texas to the Sabine about Sabinetown. 



