78 • PROCEEDINGS OF THE ACADEMY OF 



umbilical region on each side, and diminish to mere fine lines of 

 growth on the expanded part of the body volution near the aper- 

 ture. Traces of much finer longitudinal, or revolving lines are also 

 seen on well-preserved specimens. 



Greatest autero-posterior diameter of a moderate-sized specimen, 

 0.70 inch; transverse diameter of aperture, 0.72 inch. 



In its surface markings, this species seems to agree with B. 

 patulus, Hall, from which it differs materially in having its aperture 

 very much less expanded, and not overlapping the volutions pos- 

 teriorly : as well as in not having its axis umbilicate. It is much 

 more nearly like B. hiulcus, Sowerby, as illustrated by de Koniuck 

 (Ann. Foss. Carb. Belg,, pi. xxvii, fig. 4, a, b, c), but in addition 

 to being much smaller, its aperture is less transverse, and not near 

 so deeply sinuate posteriorly by the inner volutions ; while its lip 

 is very much less spread over the latter behind. It likewise 

 differs in the possession of fine obscure revolving striae. 



The specific name is given in honor of Prof. J. S. Newberry, the 

 State geologist of Ohio. 



Locality and ijosition. Dublin, Franklin Co., Ohio. Coruiferous 

 group of the Devonian. 



BELLEROPHON PROPINQUUS, Meek. 



This species agrees so nearly with the last in form and size, that 

 it may be suflSciently characterized by pointing out the few char- 

 acters in which it differs. In the first place, its transverse lines are 

 distinctly finer, more crowded, and less regularly arranged ; while 

 it has a small umbilical perforation not entirely closed by the 

 thickened lip on each side, as we see in that species. Again, its 

 dorsal band is always distinctly elevated, very narrow, and fur- 

 rowed along the middle, so as to present a biangular appearance, 

 while the transverse lines bend back more strongly in approach- 

 ing this band than in B. Newberryi, and do not impart the cre- 

 nated or subimbricated appearance in crossing the band, seen on 

 this part of that species. It is likewise destitute of the very fine 

 obscure revolving strife of B. Newberryi, and seems to have its 

 aperture somewhat less expanded, though the specimens are 

 scarcely in a condition to show the expansion of the aperture 

 satisfactorily. 



Locality and position. Same as last. 



[June 6, 



