548 GEOLOGY OF OHIO. 



Better ophon Jiscetto-striatus, Foerste. 



(Plate 25, Figs. 19 a, b, c, d, e ) 



This species when first described in the Bulletin of Denison Univer- 

 sity, Vol. I j was known only from Stoltz quarry near the Soldiers' Home. 

 In the Proceedings of the Boston Society of Natural History, 1889, its 

 occurrence at Brown's Quarry and near Hanover, Indiana, was noted. 

 Since then it has been found in the "Orthoceras block " from the base of 

 the Clinton at Huffman's Quarry, and in the shaly layers of the same 

 quarry have been found compressed shells with median slit-band, longitu- 

 dinal and less distinct transverse striae, which might be the same species. 



Recent examinations of Bellerophon stigmosus from the flinty beds of 

 the Clinton near Lockport, New York, showed similar surface ornamenta- 

 tion, but the median slit-band was raised into a low yet distinct carina, a 

 fact never true of the western forms here described. Whether this be 

 enough to distinguish the species is very questionable. 



Bellerophon (Bjicania) exigtms, Foerste 



( Plate 25, Figs. 18a, b ; Plate 31, Fig. 3 ; Plate 37a , Figs. ta. d, c.) 



This species was first described in the Bulletin of Denison University, 

 Vol. I, from the Beavertown marl, at Huffman's Quarry. Since then it 

 has been found in the upper more shaly courses at the same quarry, at the 

 quarry north of Beavertown, and in the equivalent of the Beavertown marl at 

 Geo. Young's Quarry. In the Proceedings of the Boston Soc. Nat. Hist., 

 1889, larger specimens from Hanover, Indiana, were referred to this species, 

 and the specimen from Todd's Fork, Ohio, showing surface markings, 

 was also referred here. As at present understood this species presents 

 two constant characteristic features; one of these is the narrow umbilicus, 

 the last whorl not closing the same; the second is the character of its 

 surface ornamentation. This consists of transverse striae only, which 

 from the low carina or median angulation of the shell bend backwards- 

 The sides of the shell spread out considerably at the aperture. The 

 marl specimens are usually small, and show rather coarser transverse striae, 

 moreover the carina in many specimens is a little more developed. The 

 specimens from Todd's Fork are larger, the carina is always only a low 

 median angulation, and the transverse striae are perhaps a little finer. 

 The largest specimen measured was 18 mm. across, and its aperture must 

 once have spread to 19mm. 



Bellerophon (Bucania) opertus, sp. nov. 



Plate 25, Figs. 18c, d; Plate 37 a , Figs. 3a. b.) 



The type specimen of this species is a specimen from Hanover, In 

 diana, bat small forms, apparent^ of the same species, though not pre- 

 serving the exterior markings, occur in considerable numbers at 



