46 C. L. HERRICK — THE CUYAHOGA AND WAYERLY. 



S. tenuispinatus, Her., from the Cuyahoga, nearly resembles S. setigerus of 

 the Chester, but is more rhombic in outline. The form we have compared 

 with S. hirtus is quite different and is from the Kinderhook. The specimens 

 of the present species so far seen are from the sandstone of the upper 35 feet 

 of the series at Portsmouth and elsewhere, and, though much smaller than 

 the western types, agree with the Keokuk species better than either of the 

 others noted. The enormous curved spines are well shown in the figure. 

 (It may be added that all the Keokuk species found in Ohio are smaller 

 than their western representatives from limestone strata.) 



CYPRICARDINIA (CF. SCITULA). 

 (Plate!, fig. 15.) 



This species is figured because of its close resemblance to the form de- 

 scribed from Moot's run, in the lowest one hundred feet of the Waverly — 

 i. e., the Cuyahoga shales. The beautiful little shell occurs sparingly in the 

 concretions of Kichland beds also.* The form figured herewith occurs in 

 the upper 35 feet of the Waverly in Scioto county, and would thus seem to 

 be upon the horizon of the Keokuk or upper Burlington, and is associated 

 with fossils of that age. It differs from the types of the species quoted in 

 the less prominent beak, more uniformly arched anterior margin, and less 

 obliquity of the posterior margin. In surface characters and general ap- 

 pearance the two are very similar, and it seems at present unwarrantable to 

 attempt to separate them. 



SPIRIFERINA SPINOSA, HALL. 

 (Plate 1, fig. 19.) 



While possibly a distinct variety, the little form occurring rather abun- 

 dantly on the uppermost horizon of the Waverly appears more closely allied 

 to the Chester species than either of those common beneath that level. 



DISCINA MAGNIFICA, SP. N. 

 (Plate I, fig. 17.) 



The largest of our specimens of the Carboniferous genus Discina was 

 found by W. F. Cooper in freestone a few^ feet above conglomerate II, at 

 Hemlock Falls, Ashland county, and also upon the same horizon at Wooster. 

 It is, therefore, upon the same stratigraphical level as Orbiculoidea (?) pleu- 

 rites. 



Upper valve oval, elliptical, or nearly circular, usually with the sides some- 

 what straightened ; beak exactly one-fifth the length from the dorsal margin ; 



* Bulletin Denison University, vol. IV, 1888, p. 38. 



