294 SYSTEMATIC PALEONTOLOGY 



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. 239, pi. ix, tig. 25. 

 Amphidesma carinata Conrad, 1S38, Fossils of tlie Medial Tertiary, p. 37, pi. xix 



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

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

 Si7iodesniia carinata Tuomey and Holmes, 1856, Pleiocene Fossils of South Carolina, 



p. 93, pi. xxiii, tig. 2. 

 ^&?'a carm«/« Conrad, 1863, Proc. Acad. Nat. Sci. Pliila., 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. 

 iiemele cari?iatu Dall, 1900, Trans. Wagner Free Inst. Sci., vol. iii, pt. v, p. 988, pi. 



xxxvi, figs. 33, 26. 



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

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

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

 teeth none." Conrad, 1830. 



Fine concentric striae between the distant, elevated ones; posterior side 

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

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

 tinct; muscle impressions subequal; pallial sinus profound. 



Length, 22 mm. ; height, 16 mm. ; diameter, 4 mm. 



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

 Choptank Formation, Cordova. Calvert Formation. Chesapeake 

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



Collections. — Maryland Geological Survey, Johns Hopkins Universiiy, 

 U. S. National Museum. 



Semele carinata yar. compacta 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, flgs. 23, 26. 



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

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



