Marylaxd Geological Sl-rvey 153 



si>ecies. The species is characterized l)y its foi'm, moderate convexity, 

 nearly vertical cardinal spines and inediuni nninl)er of rounded or sub- 

 angular striae. It is readily distinguished from C. mucronatus by the 

 more numerous striae, which are also more angular and bifurcate more 

 frequently, as well as the direction of the cardinal spines. It is more 

 closely related to C. scitithis, but it ditfers in its greater proportional 

 length, by the smaller number of rounded, coarser striae, the usually 

 greater convexity of the ventral valve towards the apex and the smaller 

 number and vertical direction of the cardinal spines. 



Length, medium specimen, 7 mm.; width, 8 mm.: Large specimen, 

 length, S-11 mm. : width, 10-12 mm. 



Occurrence. — Romney Formation, Hamilton Member. B. & 0. E. R. 

 cut at 21st Bridge. Williams Eoad, Si/o miles southeast of Cumberland ; 

 east bank Evitts Creek below Wolfe Mill ( ?) ; in Jennings Eun, i/o mile 

 west of Corriganville ; on National Eoad, I/2 mile west of Tonoloway 

 Eidge ; B. & 0. E. E. cut at 21st Bridge ; on Oldtown Eoad, east of Mary- 

 land Ave., Cumberland; McCoys Ferry; southwest of McCoys Ferry; on 

 the Hancock-Harrisonville Eoad about 2 miles north of Hancock; Ernst- 

 ville ; on National Eoad northeast of Cumberland ; in run at Hancock east 

 of Catholic church ; along Flintstone Creek in Gilpin ; west of Lock No. 5() 

 at Great Cacapon; west of iron bridge over Town Creek northeast of 

 Oldtown; on National Eoad, 4 mile west of Licking Creek; W. Va. side 

 Potomac Eiver about 3 miles south of Cumberland ( ?) ; B. & 0. E. E. 

 cut at Hancock Station, W. Va. ; on road about half way between Eom- 

 ney and Hanging Rock, W. Ya. 



Collections. — Maryland Geological Survey; American Museum of 

 Natural History. 



Choxktes LEPiDrs Hall 

 Plate XII, Figs. 9-13 



Chonetes lepida Hall, 1857, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 148. 

 Chonetes lepida Hall, 1867, Pal. N. Y., vol. iv, pp. 132, 142, pi. xxi, flgs. 5o-5e; 



pi. xxii, figs. 12, 13. 

 Chonetes lepidus Schuchert, 1897, Bull. U. S. Geol. Surv., No. 87, p. 175. 

 Chonetes lepidus Clarke, 1903, N. Y. State Mus., Bull. 65, p. 211. 

 Chonetes lepidus Grabau and Shimer, 1907, N. Am. Index Fossils, vol. ii, p. 



237. figs. 289d, e. 



