223 Systeaiatic Paleontology — Middle Devonian 



Occurrence. — Romney Formation, Onondaga Member. Williams 

 Eoad, 3 1/2 miles southeast of Cumberland. 

 Collection. — U. S. Xational Museum. 



[E. M. Kindle.] 



Genus TELLINOPSIS Hall 



Tellinopsis subemarginata (Conrad) 

 Plate XXII, Figs. 11, 12 



Nuculites subemarginata Conrad, 1842, Jour. Acad. Nat. Sci., Phila., voL viii, 

 p. 249, pL XV, fig. 5. 



Tellinopsis subemarginata Hall, 1870, Prelim. Notice Lamellibranchiata 2, 

 p. 80. 



Tellinopsis subemarginata Hall, 1885, Pal. N. Y., vol. v, pt. i, Lamelli- 

 branchiata ii, p. 464, pi. Ixxvi, figs. 21-31. 



Tellinopsis subemarginata Clarke, 1903, N. Y. State Mus., Bull. 65, p. 521. 



Tellinopsis subemarginata Grabau and Shimer, 1909, N. Am. Index Fossils, 

 VOL i, p. 386, fig. 488d. 



Description. — "Shell large, elliptical, subquadrate; length more than 

 once and a half the height; basal margin straight or gently curving; pos- 

 terior extremity subemarginate in the middle and rounded above and 

 below, sometimes truncate or rounded with no emargination ; anterior end 

 regularly rounded, large, usually equaling or greater than the posterior 

 half of the shell ; cardinal line gently arcuate. Valves moderately convex 

 below and toward the extremities, becoming gibbous in the middle and 

 umbonal region; beaks subcentral, rather prominent, elevated above the 

 hinge-line and incurved; umbonal slope rounded, distinct, defined above 

 by a depression which is sometimes a furrow extending from the beak 

 to the middle of the posterior margin or below, producing a slight emargi- 

 nation. Surface marked by fine concentric striae, which are sometimes 

 fascicled, producing undulations of the surface, and also by radiating 

 striae which are more or less distinct." Hall, 1885. 



A few well preserved specimens of this species have been found in the 

 bluish somewhat arenaceous shales of Evitts Creek below Wolfe Mill and 

 on the southern bank of the Potomac River three miles below Cumberland. 

 The flattened space, limited on each side by a low ridge, which extends 

 from the anterior side of the umbo to the antero-basal margin of some of 



