OF DENISON UNIVERSITY. 
47 
more or less plicate. The apex of our specimens resembles Meek’s 
figures. 
ORTHOCERAS HETEROCINCTUM, Win. ? 
The specimens referred to this species are all fragments and 
are insufficient to fully determine the identity. 
Shell unequally annulated, tapering rather rapidly, section sub- 
circular, siphuncle central (?). Chamber of habitation very long, an- 
nulated irregularly, annuli rounded? separated by shallow concave 
grooves. Septa slightly oblique, distant about one-fourth the diame- 
ter or less ; septate portion very irregularly or scarcely annulated ; sur- 
face marked by close, concentric, raised striae. Transverse diameter, 
12 mm., chamber of habitation, 38 mm., distance of septa, 3 mm. 
Lodi and Burbank, Ohio. 
GYROCERAS, sp. 
A species apparently of this genus with close resemblance to G. 
Rockfordensis, M. & W. is found in the upper division, perhaps sev- 
enty feet above conglomerate II. It seems rather larger than the 
species quoted, but in general characters, so far as known, is similar. 
CONULARIA VICTA, White ? 
' (Plate VIII, Fig. 3.) 
White, Proc. Post. Soc. N. H, vol. IX, p. 22. 
Shell square-pyramidal, moderately acute, uninclined, with the 
sides nearly equal, and moderately convex, inclined to each other by 
about 15 degrees. The angles are marked by the usual grooves, into 
which the striae pass without abrupt downward flexture, meeting near- 
ly directly, while the middle of the lateral faces bears an ill-defined 
suture (which is rather the intersection of two synclinal planes of the 
surface than a groove) where the striae meet at rather large angle and 
generally in opposition rather than alternately. The inclination of the 
striae is such that at the median groove the striae are nearer the aper- 
ture by the width of from five to seven striae than at the angles. The 
surface is marked by very numerous, acutely ridged striae, of which 
there are 28 to the centimeter or 70 to the inch, these striae were 
sharply ridged or keeled but apparently not crenulated, groove separ- 
