MARYLAND GEOLOGICAL SURVEY 315 



Subfamily DOSINIIN/E. 



Genus DOSINIA Scopoli. 



DosiNiA ACETABULUM Conrad. 



Plate LXXXIII, Fig. 1, Plate LXXXIV, Fig. 1. 



Artemis acetabulum Conrad, 1832, Fossil Shells of the Tertiary, p. 20, pi. vi, fig. 1. 

 Artemis aceiabuhmi Conrad, 1838, Fossils of the Medial Tertiary, p. 29, pi. xvi, 



fig. 1- 

 Dosinia acetabulum Conrad, 1863, Proc. Acad. Nat. Sci. Phila, vol. xiv, p. 575. 

 Dosinia acetabulum Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 10. 

 Dosinia acetabulum Whitfield, 1894, Mon. xxiv, U. S. Geol. Survey, p. 73, pi. xiii, 



flg. 2. 

 Dosinia (Dosinidia) acetabulum Dall, 1903, Trans. Wagner Free Inst. Sci., vol. iii, 



pt. vi, p. 1230. 



Description. — " Lentiform, with numerous concentric striae, which are 

 rather sharp and elevated on the anterior and posterior sides; cardinal 

 f osset large, oblong, profound ; with age, almost obliterating the posterior 

 tooth; right valve with three teeth, the posterior one long and sulcated 

 longitudinally ; two anterior teeth approximate ; left valve with four teeth, 

 three of them distant ; the anterior tooth somewhat pyramidal and enter- 

 ing a groove formed by two slight elevations in the opposite valve." Con- 

 rad, 1832. 



Length, 76 mm. ; height, 77 mm. ; diameter, 22 mm. 



Occurrence. — St. Mary's Formation. Cove Point, Langley's Bluff, 

 St. Mary's Eiver. Choptank Formation. Governor Eun, 2 miles south 

 of Governor Eun, Flag Pond, Jones Wharf, Turner, Pawpaw Point, St. 

 Leonard Creek, Sand Hill, Cordova, Greensboro, Trappe Landing, Peach 

 Blossom Creek, Dover Bridge. Calvert Formation. 3 miles south of 

 Chesapeake Beach, Plum Point, "White's Landing, Lyon's Creek, Reed's. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



Genus CLEMENTIA Gray. 



Clementia inoceriformis (Wagner). 

 Plate LXXXII, Figs. 1, 2. 



Venus inoceriformis Wagner, 1839, Jour. Acad. Nat. Sci. Phila., vol. viii, 1st ser., 



p. 51, pi. i, tig. 1. 

 Venus inoceriformis Conrad, 1845, Fossils of the Medial Tertiary, p. 70, pi. xl, flg. 1. 

 Clementia inoceriformis Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 575. 

 Clementia inoceriformis Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), 



p. 10. 



