1905.] NATURAL SCIENCES OF PHILADELPHIA. 15 



LUOINID^. 

 Xucina cretaoea (Conrad), Whitfield. 



Lucina cretacea Whitfield, Mon. U. S. Geol. Surv., IX, 129, pi. 18, figs. 23-25, 

 1885. 



Lucina smookana Whitf., Mou. U. S. Geol. Sur., IX, 130, pi. 18, figs. 21, 22, 1885. 



DIPLODONTID^ 



Tenea pingais (Conrad). 



Lucina pinguis Coiir., Jour. Acad. Nat. Sci., II, 2 ser., 275, pi. 24, f. 18, 



1853. 

 Mysia gihbosa Gabb, Jour. Acad. Nat. Sci., IV, 2 ser., 302, pi. 48, f. 17 



(not 18), 1860. 



Both the type.s of Conrad and Gabb. 

 Tenea parilis (Courad). 



Mysia parilis Conr., Jour. Acad. Nat. Sci., IV, 2 ser., 278, pi. 46, f. 8, 1860. 



Type as figured in the Am. Jour. Conch., pi. 3, f. 12, and type of 

 the genus Tenea. 



CARDIID^. 

 Cardium dumosum Conrad, Amer. Jour. Couch., VI, 75, 1870. 



The type and specimen figured by Whitfield (pi. 20, figs. 9 and 13). 



Cardium ripleyanum Conrad, Am. Jour. Conch., V, 96, pi. 9, f. 6, 1869. 

 Cardium (Laevicardium) spillmani Conrad. 



Cardium spillmani Conr., Jour Acad. Nat. Sci., Ill, 2 ser., 326, pi. 34, f. 3 



1858. 



Type of the genus Pachycardium Conrad {Am. Jour. Conch., V, 96, 

 1807). 



Cardium (Lsevicardium) perelongatum (Whitfield). 



Protocardiuyn perelongatum Whitf., Mon. U. S. Geol. Sur., IX, 136, pi. XXI, 

 figs. 4, 5, 1885. 



There is little doubt but that this is only the internal cast of C. 



spillmani. 



Cardium (Laevicardium) burlingtonense (Whitfield). 



Pachycardium Burlingtonense Whitfield, Mon. U. S. Geol. Sur., IX, 138, 

 pi. XXI, figs. 6, 7, 1885. 



This may also prove to be only a form of C. spillmani. 



Protocardia arkansense (Conrad). 



Cardium arkansense Conr., Proc. Acad. Nat. Sci., 1855, 266. 



ISOCARDIID^. 

 Isocardia oonradi tJabb, Jour. Acad. Nat. Sci., IV, 2 ser., o93, pi. 68, f. 21, 1860. 



VENERIDiE. 

 Cyprimeria excavata (Morton). 



Cytherea excavata Mort., Syn. Org. Rem., 67, pi. V, f. 1, 1834. 



