Maryland Geological Survey 180 



to demonstrate it as no one knows where or what tlie original specimen is. 

 It seems to me wiser and safer to retain Conrad's name as we know 

 definitely what Conrad was talking about." ' Atwater's figures are crude 

 and from them the writer would hardly feel warranted in accepting the 

 identity of the two forms. Prof. Schuchert's observation, however, is that 

 " Atwater's specimen was found in the drift of Ohio. Mr. Miller is correct 

 in regarding it the same as the well-known 5'. mucronatus." ' Atwater's 

 home was in Circleville, Pickaway County, in southern central Ohio, and 

 it is apparently generally considered that the specimen was found in that 

 vicinity. Much of Pickaway County is deeply covered by drift and known 

 as the Pickaway plains, the greater part of which is underlain by the 

 Ohio shale, which is the case geologically at Circleville. Atwater states 

 that the specimen " is a light drab-colored limestone," ' but did not state 

 whether it was loose or obtained from solid rock. Miller in calling atten 

 tion to the synonymy of the species stated that " Circleville is not far 

 distant from exposures of the Hamilton group " ; * still the distance 

 to rocks containing typical specimens of Spirifer mucronatus is probably 

 considerably greater than he supposed. In Deep Cut north of Prout's 

 Station, about six miles south of Sandusk}^ at the locality given by 

 Newberry.'^ The writer collected typical specimens of this species from 

 the light gray calcareous shale of Hamilton age which occurs in the ditch 

 below the base of the black Huron shale. Again, in the drift overlying 

 the Eichmond formation on the bank of Morris Hill Eun about four 

 miles south of Waynesville, in southwestern Ohio, a very characteristic 

 specimen of this species M^as obtained. This locality is south of west of 

 Circleville and, therefore, it is shown that specimens of this species have 

 been carried in the drift farther to the south than Circleville. 



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

 E. E. cut at 31st Bridge (?). Williams Eoad, 31,4 miles southeast 

 of Cumberland; east bank Evitts Creek below Wolfe Mill; Williams 



' Letter from Dr. J. M. Clarke, April 20, 1901. 



^ Bull. U. S. Geol. Surv., No. 87, p. 401. 



^ Loc. cit., p. 245. 



* Proc. Davenport Acad. Nat. Science, vol. ii, p. 220. 



"Rept. Geol. Surv. Ohio, vol. ii, pt. i, 1874, p. 190. 



