Maryland Geological Survey 151 



50 to GO on the margin ; line concentric striae are visible on well-pre- 

 served specimens. 



There are specimens in Maryland which in size, outline and other 

 characters agree closely with the specimens figured by Hall from the 

 New York Hamilton and stated to represent specimens of the ordinary 

 proportions (see figs. 4a and ib, pi. xxi, vol. iv. Pal. N. Y.). Other 

 specimens are perhaps twice the size of the former, but with the same 

 general characters, which are also referred to this species. Numerous 

 specimens of this size and general appearance have been collected by the 

 writer in the Hamilton and Ithaca formations of New York which he 

 has considered as belonging to this species. In the office of the New 

 York State Paleontologist are specimens from the Hamilton shales of 

 that state labelled Chonetes scitulus which are fully as large as any of 

 the Maryland specimens and marked by from 50 to 60 striae. The re- 

 sult of this comparison apparently shows that the larger as well as the 

 smaller Maryland specimens belong to this species. Some of the best 

 specimens of this larger form were found in a bluish argillaceous shale 

 on the West Virginia side of the Potomac between 3 and 4 miles south 

 of Cumberland ; other good specimens were found at Ernstville in Wash- 

 ington County. This species is distingnished by its outline, consider- 

 ably greater width than length, the large number of sti'iae (from 50 to 

 more than 60) at the margin and the obliquely directed cardinal spines. 



Length, 6-8 mm.; width, 9-11 mm. 



Length large specimen, 9-10 mm.; width, 15-16 mm. 



Occurrence. — Eomney Formation, Hamilton Member. B. & 0. R. R. 

 cut at 31st Bridge ( ?). Williams Road, 314 miles southeast of Cumber- 

 land ( ?) ; on National Road, I2 t^^^^ west of Tonoloway Ridge; B. & 0. 

 R. R. cut at 21st Bridge; on Oldtown Road, east of Maryland Ave., Cum- 

 berland; McCoys Ferry; southwest of McCoys Ferry; on the Hancock- 

 Harrisonville Road about 2 miles north of Hancock; Ernstville; on 

 National Road northeast of Cumberland; in run at Hancock, east of 

 Catholic church; along Flintstone Creek in Gilpin; west of iron bridge 

 over Town Creek northeast of Oldtown ; B. & 0. R. R. cut opposite Han- 

 cock, W. A'a.; on road about half way between Romney and Hanging 



