Maryland Geological Suhvey 281 



West Virginia. In addition, however, tliere are in some of the finer and 

 more argillaceous shales rather hadly crushed specimens of the shell which 

 show distinctly the characteristic surface markings. Furthermore, 

 Hall stated that " this species extends in a southwesterly direction 

 to Maryland and Virginia" and that casts of the species from Maryland 

 rounded or subangrilar on the periphery " measure one inch and a half 

 in diameter, and one inch and three-eighths in height, and consist of 

 about five distinct volutions" (Pa,l. N. Y., vol. v, pt. ii, p. 70) ; while 

 a large internal cast from the Hamilton group at Cumberland is figured 

 (see pi. xix, fig. 15). Large internal impressions agreeing in size, number 

 of whorls and apparently all characters, except that perhaps the revolving 

 band on the body-whorl is not so strong, with the figure just nuaitioned 

 were collected on the West Virginia bank of the Potomac Biver, opposite 

 Madder's Island, four miles south of Cumberland ; while specimens from 

 the same side of the river about three miles south of Cumberland agree 

 closely in form, strength of striae and other characters with figure 9 

 of the same plate which represents a specimen from tlie Hamilton of 

 New York. Internal impressions and the outside of specimens from West 

 Virginia and Maryland were compared with corresponding ones, labeled 

 as belonging to this species, in the office of the New York State Paleon- 

 tologist and found to agree satisfactorily. The most distinctive char- 

 acters of the species are the shape, size, carinae and strong concentric 

 striae. 



Length, 35, 32, 18 mm.; width, 40, 37, 22 mm. 



Occurrence. — Romney Formatio.nt. Hamilton Member. East side 

 Warrior Mt. east of Eush ; Town Creek Road at Geo. Diefenbaugh's ; on 

 National Road 4 mile west of Tonoloway Ridge ( ?) ; west of iron bridge 

 over Town Creek northeast of Oldtown; on Oldtown Road east of Mary- 

 land Ave., Cnmberland; on Hancock-Harrisonville Road about 2 miles 

 north of Hancock; Ernstville; along Flintstone Creek in Gilpin; W'. Va, 

 side Potomac River 3 and 4 miles south of Cumberland; on road about 

 half way between Romney and Hanging Rock, W. Va. ; on Romney-Hang- 

 ing Rock Road about ^ mile north of Romney, W. Va. 



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

 ural History. 



