282 SYSTEMATIC PALEONTOLOGY 



St. Mary's Eiver. Choptank Foemation. Governor Eim, 2 miles 

 south of Governor Eun, Flag Pond, Jones Wharf, Turner, Pawpaw 

 Point, Dover Bridge, Peach Blossom Creek, Trappe Landing, Cordova. 

 Calveet FoEiiATiON. Fairhaveu, Chesapeake Beach, 3 miles south of 

 Chesapeake Beach, Plum Point, Lj^on's Creek, White's Landing, Tru- 

 man's Wharf, Wye Mills, 3 miles west of Centerville, Church Hill. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum. 



CoEBULA cuneata Say. 

 Plate LXVII, Figs. 15, 16, 17, 18, 19. 



Corbula cuneata Say, 1824, Jour. Acad. Xat. Sci. Phila., vol. iv, 1st ser., p. 152, 



pi. xiii, fig. 3. 

 Corbula inceqtiale Conrad, 1838, Fossils of the Medial Tertiary, p. 6, pi. iii, lig. 3, 



(left hand one), (diagn. and remarks excluded.) 

 Corbula cuneata Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 12. 

 Corbula {Cuneocorbida) cuneata Ball, 1898, Trans. Wagner Free Inst. Sci., vol. iii, 



pt. iv, p. 854. 



Description.—" Shell transversely ovate-trigonal, acutely angulated or 

 somewhat rostrated before, and depressed on the anterior slope, which 

 is separated from the disk by a subacute line: surface of both valves 

 similarly striate with equal, elevated, equidistant lines, forming grooves 

 between them; the strise on the smaller valve are rather more distant: 

 umbones not prominent." Say, 1824. 



It may be distinguished from C. incequalis by having striae that are 

 much finer and more close set, equal, and equidistant than in C. 

 incequalis. It is also much less common. When found at all it is more 

 commonly at the Jones Wharf horizon. 



Length, 12 mm.; height, 7.5 mm.; diameter, 2.5 mm. 



Occurrence. — Choptank Foemation. Governor Eun, 2 miles south 

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

 Trappe Landing, Greensboro, Cordova. Calveet Coemation. Plum 

 Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum. 



