Maryland Geological Survey 307 



Occurrence.- — Oriskany Formation, Hidgely Member. Williams 

 Eoad near Cumberland. 



Collection. — Maiyland Geological Survey. 



Genus SCHIZOPHORIA King' 

 SCIIIZOPIIORIA MULTISTRIATA (Hall) 



Plate LVl, Figs. 5-8 



Orthis multistriata Hall, 1857, Tenth Ann. Kept. N. Y. State Cab. Nat. Hist., 



p. 45, figs. 1, 2. 

 Orthis multistriata Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 176, pi. xv, 



figs. 2a-2f, 1861. 

 Schizophoria multistriata Hall and Clarke, 1892, ibidem, vol. viii, pt. i, pp. 



212, 226, pi. vio. fig. 25. 



Description. — " Shell circular or transversely suboval : ventral valve 

 most convex near the beak, depressed so as to form a broad shallow unde- 

 fined sinus, which sometimes gives to the front a subemarginate aspect; 

 beak a little more prominent than the opposite, slightly incurved : dorsal 

 valve more elevated, most convex between the middle and the beak ; beak 

 rising above the hinge, obtuse and incurved; hinge-line straight, about 

 half the width of the shell ; area small ; foramen narrow, extending nearly 

 to the apex. Surface marked by fine, crowded, nearly equal striae, which 

 increase chiefly by implantation, and are crossed by a few faint concentric 

 lines of growth." Hall, 1857. 



Length 1.9 cm. ; width 2.1 cm. 



Occurrence. — Helderberg Formation, New Scotland Member. 

 Devil's Backbone. 



Collection. — George M. Eoeder. 



Schizophoria oriskania n. sp. 



Plate LVI, Figs. 9-13 



Description. — This species is most closely related to S. propinqua of the 



Onondaga limestone, but has a less pronounced ventral sinus and ventral 



cardinal area, while the muscular scars and vascular sinuses are far less 



' See Hall and Clarke, 1892, Nat. Hist. N. Y., Pal., vol. viii, pt. i. p. 211. 



