MARTLAKD GEOLOGICAL SURVEY 297 



Genus CUMING lA Sowerby. 

 CcJMiNGiA MEDiALis Conracl. 

 Plate LXXII, Figs. 11, 12. 



Cumingia tellinoidcs Conrad, 1838, Fossils of the Medial Tertiary, p. 28, pi. xv, 



fig. 4. 

 Not Cumingia tellinoides Conrad, 1831. 

 Anatina tellinoides H. C. Lea, 1845, Trans. Amer. Philos. Soc, vol. ix, p. 237, pi. 



xxxiv, fig. 12. 

 Lavignon tellinoides d'Orbigny, 1852, Prod. Pal. Strat., vol. iii, p. 101, No. 1891. 

 Lavignon tellinoides Tuomey and Holmes, 1856, Pleiocene Fossils of South Carolina, 



p. 92, pi. xxiii, lig. 1. 

 Cumingia tellinoides Conrad, 1863, Proc. Acad. Nat. Sei. Phila., vol. xiv, p. 574. 

 Cumingia tellinoides Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 11. 

 Cumingia medialis Conrad, 1866, Amer. Jour. Conch., vol. ii, p. 106. 

 Cumingia medialis Dall, 1900, Trans. Wagner Free Inst. Sei., vol. iii, pt. v, p. 999. 



Description. — " Shell ovate-trigonal, thin, with numerous prominent 

 concentric wrinkled strise; anterior side ventricose; the posterior side 

 contracted, subcuneiform ; the base near the extremity slightly emargi- 

 nate ; cardinal fosset large ; lateral teeth very prominent." Conrad, 1838. 



The anterior side is inflated, the posterior side depressed, this depres- 

 sion extending to the base and producing a slight emargination near the 

 posterior extremity; within, chondrophore prominent, projecting, spoon- 

 shaped. Two left valves in some material belonging to the Johns Hop- 

 kins University are labeled from Jones Wharf, but their state of preserva- 

 tion and coloration makes it seem more prol^able that they are from Vir- 

 ginia. 



Length, 25 mm. ; height, 18 mm. ; diameter, 5.5 mm. 



Occurrence. — Choptank Formation (?). Jones Wliarf (?). 



Collection. — Johns Hopkins University. 



Family TELLINID/E. 



Genus TELLINA (Linne) Lamaick. 



Section MERISCA Dall. 



TeLLINA iEQUISTRIATA Say. 



Plate LXXII, Fig. 13. 



TelUna ceqinstriata Say, 1824, Jour. Acad. Nat. Sei. Phila., vol. iv, 1st ser., p. 145, 

 pi. X, fig. 7. Reprint, Bull. Amer. Pal., vol. i, No. 5, p. 321, pi. xxix, fig. 7. 



Tellina (JleHsca) (equistriaia Dall, 1900, Trans. Wagner Free Inst. Sei., vol. iii, pt. v, 

 p. 1020. 



