MARYLAND GEOLOGICAL SURVEY 369 



Superfamily ANOMIACEA. 

 Family ANOMIID/E. 



Genus ANOMIA (Linne) Mliller. 

 Anomia simplex d'Orbigny. 

 Plate XCVIII, Fig. 1. 



Anomia simplex d'Orbigny (1845, Spanish ed.), l85o, Moll. Cubana, vol. ii, p. 367, 



pi. xxxviii, figs. 31-33. 

 Anomia ephippium var. Conrad, 1845, Fossils of the Medial Tertiary, p. 75, pi. xliii, 



fig. 4. 

 Anomia Conradi d'Orbigny, 1852, Prod. Pal. Strat., vol. iii, p. 134, pL xxv, fig. 30. 

 Anomia ephippium Tuomey and Holmes, 1855, Pleiocene Fossils of South Carolina, 



p. 18, pi. V, fig. 4. 

 Anomia ephippium Holmes, 1858, Post-Pleiocene Fossils of South Carolina, p. 11, 



pi. ii, fig. 11. 

 Anomia ephippium Emmons, 1858, Rept. N. Car. Geol. Survey, p. 377. 

 Anomia Conradi Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 583. 

 Anomia Conradi Meek, 1864, Miocene Checlc List, Smith. Misc. Coll. (183), p. 4. 

 Anomia simplex Dall, 1889, Bull, xxxvii, U. S. Nat. Mus., p. 33, pi. liii, figs. 1, 2. 

 Anomia simplex Dall, 1898, Trans. Wagner Free Inst. Sci., vol. iii, pt. iv, p. 784. 



Description. — Shell thin, translucent, irregularly circular in outline; 

 superior valve strongly convex or inflated ; exterior surface with very faint 

 irregular concentric growth striations or, more commonly, smooth; 

 within, byssal scars distinct, subequal, close; lower valve irregularly flat, 

 with irregular concentric growth striae. 



Length, 15 mm.; width, 15 mm.; diameter, 6 mm. (small upper 

 valve) . 



Occurrence. — St. Mary's Formation. St. Mary's River. 



Collection. — Maryland Geological Survey. 



Anomia aguleata Gmelin. 

 Plate XCVIII, Figs. 2, 3, 4, 5. 



Anomia aculeata Gmelin, 1792, Syst. Nat., t. vi, p. 3346. 



Anomia aculeata Gould, 1841, Invert. Mass., p. 139, flg. 90. 



Anomia aculeata Gould (Binney's), 1870, Invert. Mass., p. 304, fig. 498. 



Anomia aculeata Verrill, 1873, Rept. U. S. Fish Com. for 1871-3, p. 697, pi. xxxii, 



figs. 339-340a. 

 Anomia aculeata Dall, 1889, Bull, xxxvii, U. S. Nat. Mus., p. 33, pi. liii, figs. 5-8. 

 Anomia aculeata Dall, 1898, Trans. Wagner Free Inst. Sci., vol. iii, pt. iv, p. 784. 



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