OF DENISON UNIVERSITY. 89 
these, well-preserved specimens show less distinct revolving striae upon 
the sides, especially near the umbilicus. 
We have experienced much difficulty in identifying our Bellero- 
phons. This species is poorly represented and very variable. The 
form which is referred with confidence to B. cyrtolites, is found in the 
shales below congl. I, and is about the size of the species quoted. 
The form is exactly as in the Illinois types. Very careful examination 
is necessary to discover the revolving lines; 13 is the maximum ob- 
served diameter. 
A larger form occurs in the shales below congl. II. in which the 
concavity of the sides is more marked, as also the abruptness of the 
descent to the umbilicus. 'These are all in the form of casts preserv- 
ing impressed lines of growth; 22 mm. is a common dimension for the 
greatest diameter. Above congl. II, in a blue friable shale, speci- 
mens more like the type are again found. 
The second variety has been collected at Newark, Rushville and 
Granville, and has been discriminated as B. cribristriatus. 
There are from 6 to 10 strire in the space of one- tenth inch near 
the aperture. Dorso-ventral diameter of aperture perhaps 12-15 mm, 
transverse diameter 10-12. 
Bellerophon> galericulatus, Win. 
(Plate IX, Fig. 32.) 
“Shell small, globose, involute, carinate, ex-umbilicate, longitudi- 
nally striate, and deeply notched. Dorsum broadly and regularly 
rounded, without any evidences of a band except in approaching the 
aperture of adult shells, where a rather broad band, with ventrally 
concave incremental lines can be faintly traced, Aperture crescentic, 
not suddenly expanded, strongly auriculate, with the ears hanging de 
tached from the inner whorl. Notch infundibuliform, deep and broad, 
obtuse, its sides reaching the tips of the auriculations. Umbilicus 
closed, scarcely indented. Dorsal and dorso lateral surface marked 
by about 28 longitudinal, sharply raised striae, separated by much 
wider flutings and not perceptibly modified by dorsal band until within 
half of a whorl of the aperture of the adult shell, when the two mid- 
dle striae become slightly raised and enlarged and the entire set simul- 
taneously die away. Between these stri^ and the umbilical point sim- 
