Maryland Geological Survey 561 



radial sculpture is reduced to faint striations or is altogether absent. The 

 umbones of both valves are high, narrow and acute, the ligament area 

 correspondingly high. 



Occurrence. — Monmouth Formation. Bohemia Mills, Cecil County; 

 mouth of Turner's Creek, Kent County ; Brightseat, Brooks estate near 

 Seat Pleasant, Friendly and McNeys Corners, Prince George's County. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences, New Jersey Geological Survey, U. S. National Museum. 



Outside Distribution. — Matawan Formation. Wenonah sand. New 

 Jersey. Black Creek Formation. North and South Carolina. Pee Dee 

 Sand. North and South Carolina. Ripley Formation. Exogyra pon- 

 derosa zone, Chattahoochee Elver. Alabama. Exogyra costata zone, 



G 'gia; Eufaula, Alabama; Lowndes, Chickasaw, Pontotoc and Lee 



counties, Mississippi. Sclnia Chalk. Exogyra costata zone, Sumter 

 County, Alabama; east-central Mississippi. 



Ostrea subspatulata Forbes 

 Plate XXIII, Fig. 3; Plate XXIV, Fig. 1 



ostrea subspatulata Forbes, 1854, Quart. Jour. Geol. Soc, London, vol. i, 



p. 61, text figs., pp. 61, 62. 

 Ostrea subspatulata Conrad, 1857, Mexican Boundary Survey, vol. i, pt. ii, 



p. 155, pi. x, figs. 3a, 3b. 

 Ostrea subspatulata Meek, 1864, Check List Inv. Fossils N. A., Cret. and 



Jur., p. 6. 

 Ostrea subspatulata Conrad, 1868, Cook's Geol. of New Jersey, p. 724. 

 Ostrea subspatulata Coquand, 1869, Mon. Genre Ostrea, Terrain Cret., p. 43, 



pi. xxxii, figs. 1-3. 

 Ostrea subspatulata Gabb, 1876, Proc. Acad. Nat. Sci., Phila., p. 320. 

 Ostrea subspatulata White, 1884, 4th Ann. Rept. U. S. Geol. Survey, p. 301, 



pi. xxxvii, figs. 1, 2. 

 Ostrea subspatulata Whitfield, 1885, Mon. U. S. Geol. Survey, vol. ix, p. 32, 



pi. iii, fig. 14. 

 Ostrea subspatulata Veatch, 1906, Prof. Paper U. S. Geol. Survey, No. 46, 



pi. xi, figs. 3, 3a. 

 Ostrea subspatulata Weller, 1907, Rept. Geol. Survey of New Jersey, Pal., 



vol. iv, p. 440, pi. xlii, fig. 15. 



Description. — " Shell obovate; somewhat trapezif orm ; generally thick, 

 higher than wide : narrower at the dorsal than at the ventral or basal end, 



