OF DENISON UNIVERSITY. 
19 
'a name be required for this species it may be called B. subcordiformis. 
(x\ somewhat similar surface ornamentation is found in the otherwise 
very different B. pullchellus of Toula.) 
Seller ophoji Montfortianus, N. and P. 
(Plate II, Fig. I ; Plate V, Fig S.) 
The largest Bellerophon found at Flint Ridge agrees with this fine 
species. We are able to give more complete figures than hitherto ob- 
tained, many of our specimens, though crushed, being entire. 
Shell proximally very small, expanding rapidly; aperture enor- 
mously expanded, sub-reniform ; outer volution with a deeply impressed 
medial sulcus emarginating the lip distally ; lip thin, with a prominent 
callous where covering the inner coil. The surface is ornamented by 
strong revolving lines, which are separated by about ten striae and are 
crossed by fine concentric striae, giving the whole a delicate textile na- 
ture. In one of the specimens figured the revolving lines do not 
reach the lip, but the zone with only concentric lines seems due to 
exfoliation. The surface is also marked by distant concentric plica- 
tions which become more numerous proximally. Width of aperture, 
1.24, height, .95. 
Bellerophon deeussatus, Fleming ? ? 
(Plate II, Fig. 12. ) 
Our figure represents the dorsal surface of the outer volution, 
which is marked by a combination of revolving and concentric striae 
of nearly equal size and number. There is also a slight median fold. 
It is not certain that the identification can be sustained. 
Bellerophon carhonarius, Cox. 
(Plate II, Fig. 20.) 
This, or a closely related species is represented by only a few frag- 
ments. (Cf. also B. stramineus. ) 
“ Shell globose, broadly rounded over the dorsum ; umbilical im- 
pressions very small or closed. Aperture transversely sublunate, much 
wider than high, and strongly arched, but not expanding more rapidly 
than the uniform increase of the size of the volutions ; inner lip nearly 
wanting or little developed ; outer lip moderately thick near the umbil- 
