294 SYSTEMATIC PALEOXTOLOGY 



Family SEMELID/E. 



Genus SEMELE Schumacher. 

 Semele carinata (Conrad). 

 Plate LXXII, Figs. 1, 2, 3. 



Amphidesma carinata Conrad, 1830, Jour. Acad. Nat. Sci. Pbila., vol. vi, 1st ser., 



p. 229, pi. ix, fig. 25. 

 Amphidesma carinata Conrad, 1838, Fossils of the Medial Tertiarj-, p. ^7, pi. xix 



[Isted.], fig. 7; [2nd ed.], fig. 11, 1840. 

 Siuodesmia carinata d'Orbigny, 1852, Prod. Pal., vol. iii, p. 101, No. 1890. 

 Sinodesmia carinata Tuomey and Holmes, 1856, Pleiocene Fossils of Soutli Carolina, 



p. 93, pi. xxiii, fig. 2. 

 Abra carinata Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 574. 

 Abra carinata Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 11. 

 Abra Holmesii Conrad, 1875, Kept. N. Car. Geol. Survey, vol. i, app. A, p. 19, pi. 



iii, tig. 8. 

 Semele carinata Dall, 1900, Trans. Wagner Free Inst. Sci., vol. iii, pt. v, p. 988, pi. 



xxxvi, figs. 23, 26. 



Description. — " Shell transversely ovate, with concentric, rather dis- 

 tant, elevated, acute stria; intervals transversely striated; anterior side 

 with a slight fold ; heaks rather prominent, with the apex acute ; lateral 

 teeth none." Conrad, 1830. 



Fine concentric strige hetween the distant, elevated ones ; posterior side 

 with a slight fold; posterior hasal margin obliquely truncated; lateral 

 laminse in left valve small, in right valve lateral laminte and sockets dis- 

 tinct; muscle impressions subequal; pallial sinus profound. 



Length, 22 mm. ; height, IG mm. ; diameter, 4 mm. 



Occurrence. — St. Mary's Formation. Cove Point, St. Mary's Elver. 

 Choptank Formation. Cordova. Calvert Formation. Chesapeake 

 Beach, 3 miles south of Cliesapeake Beach, Plum Point, Truman's Wharf. 



Collections. — Maryland Geological Survey, Johns Hopkins ITniversHy, 

 U. S. National Museum. 



Semele carinata yar. compact a Dall. 

 Plate LXXII, Figs. 4, 5a, 5b. 



Semele carinata var. compacta Dall, 1900, Trans. Wagner Free Inst. Sci., vol. iii, 

 pt. V, pp. 988, 989, pi. xxxvi, figs. 23, 26. 



Description. — This variety, to which the figures given by Dr. Dall for 

 8. carinata (cited above) more directly belong, is discriminated by him 



