86 PROCEEDINGS OF THE ACADEMY OP 



but I suspect, from the appearance of some of the specimens of 

 species of this genus figured by Prof. Barrande, that this is due 

 to the removal of the apex by some accident, so as to expose one 

 of the smooth septa within.^ 



Compared with G. Niagarensis, Hall, the species under con- 

 sideration evidently differs in being much more gradually taper- 

 ing, and has the transverse lines much smaller and more crowded 

 toward the larger end of the shell. In form it agrees more nearly 

 with G. simjjlex of Barrande, which, however, has the furrows 

 between the transverse lines smooth, and these lines not becoming 

 smaller and more crowded toward the aperture from a point six 

 to seven tenths of an inch from the apex. 



Locality and position. Delaware, Ohio. Corniferous division 

 of the Devonian. 



CEPHALOPODA. 



CYRTOCEEAS OHIOENSE, Meek. 



Shell long, slender, gently arched, and very graduall}^ ta- 

 pering, section nearly circular, the clorso-ventral diameter being 

 slightly greater than the transverse. Septa distant from each 

 other, on the outer or convex (ventral) side of the curve, slightly 

 more than one-sixth, and on the inner side about one-seventh, 

 the dorso-ventral diameter. Siphuncle situated near the outer 

 side of the curve, but not exactly marginal. Surface ornamented 

 by small, somewhat irregular annular ridges and strise that curve 

 a little backward in crossing the ventral side. Rather distinct, 

 raised lines also mark the surface longitudinally, so as to form 

 with the annular markings a somewhat cancellated appearance. 



Length of a specimen incomplete at both ends, and septate 

 throughout, excepting about one inch of the anterior end, 6.50 

 inches (measuring along the convex side of the curve). Dorso- 

 ventral diameter at the posterior end, 1.33 inches ; transverse 



' Since seeing these figures of Prof. Barrande' s, I am led to think it pro- 

 bable that C. hyblis, White, and C. multicostata, M. & W., may belong to 

 one species, the apparent obtusely rounded smooth apex of C. hyblis being 

 the principal character that led us to suppose the C. multicostata to be quite 

 distinct. A comparison of specimens, liowever, might show other distinc- 

 tions. 



[June 6, 



