Makylaxd Geological Survey 155 



conspicuous than on part of the Maryland specimens. Internal impres- 

 sions from the Hamilton shales of Xew York in the office of the State 

 Paleontologist labeled Chonetes lepidus are as large and identical in all 

 particulars with similar specimens from Maryland. The characteristics 

 of the species are its small size, the longitudinal mesial depression of the 

 ventral valve, bounded on each side by larger and more prominent striae 

 with smaller ones between, and the rather strong bifurcating striae, of 

 which there are ten or twelve near the umbo and twice as many or more 

 on the margin. 



Length, 2^-6 mm.; width, 3-7 mm. 



Occurrence. — Rojmxey Formation, Onondaga Member. Hanging 

 Rock, W. Va. ( ?) . Hamilton Member. B. & 0. E. E. cut at 21st Bridge. 

 East bank Evitts Creek below Wolfe Mill; Town Creek Eoad at Geo. 

 Diefenbaugh's ( ?) ; on National Road I/2 mile west of Tonoloway Ridge; 

 B. & 0. R. R. cut at 21st Bridge; Williams Road 31/2 miles southeast of 

 Cumberiand; McCoys Ferry; on National Road northeast of Cumberland; 

 in run at Hancock east of Catholic church ; along Flintstone Creek in Gil- 

 pin ; on National Road in Gilpin ; 14 rni'e north of Green Spring Furnace ; 

 west of iron bridge over Town Creek northeast of Oldtown ; on the Rom- 

 ney-Hanging Rock Eoad, about 1^ mile north of Eomney, W. Va. ; W. Va. 

 side Potomac River about 3 miles south of Cumberland ; B. & 0. R. R. 

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

 and Hanging Rock, W. Va. 



Collections. — Maiyland Geological Survey; American Museum of Nat- 

 ural History. 



Chonetes a^icinus (Castelnau) 



Plate XII, Figs. 11-21 



Lepfaena vicina Castelnau, 1843, Systeme Sil. TAmerique Septentrionale, 



p. 39, pi. xlv, fig. 9. 

 Chonetes vicina de Koninck, 1847. Recher. Animaux Foss., pt. i, p. 203. 

 Chonetes deflecta Hall, 1857, Tenth Rep. N. Y. State Cab. Nat. Hist., p. 149. 

 Chonetes deflecta Hall, 18fi7, Pal. N. Y., vol. iv, p. 126, pi. xxi, figs. 7, 8. 

 Chonetes deflecta Hall and Clarke. 1S92, Pal. N. Y., vol. vlii, pt. i, pi. xvi, 



fig. 28. 

 Chonetes vicinus Schuchert. 1897, Bull. U. S. Geol. Surv., No. 87, p. 180. 

 Chonetes vicinus Grabau and Shinier, 1907, N. Am. Index Fossils, vol. ii, p. 



236, fig. 287. 



