174 Ststematic Paleontology— Middle Devonian 



Bridge. Williams Road, 3^/o miles southeast of Cumberland ; on National 

 Eoad northeast of Cumberland ; on road east of Pine Hill about 4 miles 

 north of Oldtown; W. Va. side Potomac Eiver, 4 miles south of Cumber- 

 land. 



Collections. — Maryland Geological Surve)'; American Museum of Nat- 

 ural History. 



CaMAEOTOECIIIA SAPPHO Hall 



Plate XV, Fig. 4 



Rhynchonella sappho Hall, 1860, Thirteenth Rep. N. Y. State Cab. Nat. Hist.. 



p. 87. 

 Rhynchonella (Stenocisma) sappho Hall, 1867, Pal. N. Y., vol. iv, p. 340, pi. 



liv, figs. 33-43. 

 Camarotoechia sappho Hall and Clarke, 1893, Pal. N. Y., vol. viii, pt. ii, p. 



192, pi. Ivii, figs. 10-14. 

 Camarotoechia sappho Schuchert, 1897, Bull. U. S. Geol. Surv., No. 87, p. 168. 

 Camarotoechia sappho Grabau and Shinier, 1909, N. Am. Index Fossils, vol. i, 



p. 288, figs. 354c, d. 



Description. — Shell large; gilibous, subelliptical ; nearly straight in the 

 middle of the front, abruptly pointed at the beak; sides rounded to the 

 mesial fold and sinus. Ventral valve depressed-convex, somewhat gibbous 

 on the i;mbo ; flattened and somewhat depressed in the middle towards the 

 front ; sinus becomes well marked about one-third the distance from the 

 apex towards the front; apex abruptly acute, and more or less incurved 

 according to age. Dorsal valve gibbons, regularly arching transversely; 

 the mesial fold becoming conspicuous only towards the front; in young 

 shells only moderately convex. Surface marked by eighteen to twenty- 

 four plications, a smaller number in young specimens, those toward the 

 cardinal margin less elevated ; about four to six mark the sinus and fold. 

 In old shells the plications are grooved towards the front, and those of the 

 sides of the dorsal valve are abruptly bent towards the ventral valve. The 

 shell is concentrically marked bv line throad-like elevated striae, which are 

 more conspicuous and strongly undulating towards the front. 



An exfoliated ventral valve of this species is among the Johns Hopkins 

 collections from western Maryland, the exact locality of which is unknown. 

 It is rather more triangular in shape than the normal adult forms of this 

 species, and the sinus, which is rather deeper and more sharply defined, 

 contains three conspicuous plications \vith a less strongly defined fourth 



