PALEONTOLOGY. ±79 



HETEROPODA. 



Genus BEEEEROPHON Montfort 



Bellerophon sublcevis? 



Plate X, figs. 20 and 21. 



f Bellerophon sublcevis Hall, Trans. Albaii}' Institute, vol. iv, p. 32. 



Shell of a medium size or smaller, subglobose in general form, with a moder- 

 ately expanded lip around the sides of the aperture. Umbilicus closed, the axis 

 being solid and the auriculatious thickened at their junction with the body of the 

 shell, covering the central or axis portion. Volutions round and globular within 

 the auriculations, the inner ones projecting into and strongly modifying the forms 

 of the aperture, which is transversely reniform and expanded at the sides. Surface 

 of the shell not known from Ohio specimens. 



The Ohio specimens referred to this species are all quite imperfect ; 

 being imbedded in compact limestone and the shell replaced with crystals 

 of carbonate of lime, the}- do not give the entire characters, so their cor- 

 rect reference to B. Icsvis Hall is somewhat doubtful. The species as seen 

 on entire individuals from the original locality is slightly keeled on the 

 outer volution, and marked, rather faintly, by curved transverse striae 

 parallel to the margin of the aperture, and indicates a rather shallow but 

 broad notch in the margin of the aperture. 



Formation and Locality. — The originals of the species are from Sper- 

 gen Hill and Bloomington, Indiana ; and the Ohio specimens are known 

 from Xewtonville and Maxville, Ohio, in the Maxville limestone. 



Bellerophon alternodostis. 



Plate X, figs. 17-19. 



Bellerophon alternodosus Whitf., Ann. N. Y. Acad. Sci., 1882, p. 225. 



Shell of about a medium size, and somewhat subglobose in general form, with 

 an appearance of being slightly flattened on the dorsum in immature specimens ; 

 while on the adult forms, the dorsum is marked on the outer half of the body-volu- 

 tion by a double series of rounded nodes, those on one side of the center alternating 

 with those of the other side, and the inner margins of the two series interlocking 

 with each other. Aperture broadly elliptical, strongly modified by the projection 

 of the preceding volution, on the inner margin. Auriculations largely developed 

 and slightly reflected. Axis very distinctly perforate. Inner lip somewhat callous 

 on the protruding inner volution. Surface of the shell, so far as can be ascertained, 

 marked only by lines of growth, beyond the nodes mentioned. 



This species is somewhat similar in general form to B. Montfortianus 

 X. and P., from the Coal Measures, in its general form, but does not pos- 

 sess the strong transverse folds nor the carina between the lines of nodes 

 marking the dorsum. It also differs in the alternating positions of the 

 nodes. 



Formation and Locality. — In the Maxville limestone at Newtonville, 

 Ohio. Collection of Columbia College, New York. 



