20 
BULLETIN OF THE LABORATORIES 
icus on either side, but thinner between; sinus shallow and rounded, 
its band obscure or scarcely visible on the costated part of the outer 
whorl, sometimes a little concave, or with traces, on each side, of a 
faintly marked ridge on the smooth part of the outer volution ; surface, 
except on the terminal half or third of the body whorl, ornamented 
wdth about 18-2^ simple, rather distinct, revolving raised lines.” This 
species is widely distributed. 
Bellerophon inarcouianus, Geinitz. 
' • (Plate V, Fig. 7.) 
Several fragments are sufficient to indicate this species, but add 
nothing to the meagre description given by Geinitz and Meek. The 
shell is marked only by fine, close, unequal or alternating, revolving 
lines and has an aperture like B. montfortianus, which it approaches 
in size. 
Bellerophon (cf crassus, Meek and Worthen.) 
(Plate V, Fig. 6. ) 
This Bellerophon is derived from the flinty limestone at the sum- 
mit of Flint Ridge, and hence its horizon is 100 feet higher than the 
shells just described. Though much smaller than B. crassus, it has 
much the form of that species, yet the shell appears hot to have been 
thick. The umbilical expansions of the lip are broken, but may have 
partly covered the cavity. The markings are nearly obliterated, but 
there are indications of a mesial ridge on the dorsum. The greatest 
diameter is over one inch. 
Polyphemopsis inornata, Meek and Worthen ? 
(Plate II, Fig. 15.) 
Even the generic reference of this specimen must remain doubt- 
ful, as it is so largely imbedded in the rock. If a Polyphemopsis, it 
resembles P. inornata as nearly as any American species encountered. 
P. melanoides from Newtonville would appear to be too slender. Our 
specimen is larger than the type of P. inornata. 
