426 
PROCEEDINGS OP THE ACADEMY OP 
umbilical slope. In a specimen which is *6 (100) across the outer whorl, the 
height of the aperture is *32 (53), its width *38 (63). The number of lon¬ 
gitudinal striae in one-tenth of an inch is about 14, and the number of trans¬ 
verse striae 18. 
Locality. —Moscow, Hillsdale county. 
Bellerophon galericulatus, n. sp.—Shell small, globose, involute, ecarinate, 
exumbilicate, longitudinally striate, and deeply notched. Dorsum broadly 
and regularly rounded, without any evidences of a band, except in approach- 
' ing the aperture of adult shells, where a rather broad band with Jr^ufcraMy con¬ 
cave incremental lines can be faintly traced. Aperture crescehtic, not sud¬ 
denly expanded, strongly auriculate, with the ears hanging detached from 
the inner whorl. Notch infundibuliform, deep and broad, obtuse, its sides 
reaching to 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 the dorsal band until within half a whorl of the aperture of the adult shell, 
when the two middle strise become slightly raised and enlarged, and the entire 
set simultaneously die away. Between these strise and the umbilical point 
similar strise diverge spirally and irregular until intercepted by the former 
set, or by each other. Cast smooth, perforately umbilicate. 
Average diameter of adult *47 (100); height of last whorl at the aperture 
*26 (55) ; height of aperture *18 (38); showing the inner whorl impressed into 
the outer *08 (17); width of aperture *35 (74); depth of notch *22 (47); 
width of peripheral belt at notch *06 (13) ; separating distance between tip of 
auriculations and inner whorl *10 (21); number of strise in one-tenth of an 
inch 10, and this is the same in young and old specimens. Diameter of 
largest specimen seen ’53. 
Localities. —Marshall, Battle Creek, and nearly all other Southern outcrops 
of the Marshall Sandstone. 
This shell bears a close resemblance to B. Urei, of authors, but seems to 
differ in essential points, as follows:—From B. Urii , de Kon. (An. Foss. 356, 
xxx. 4) in being only half the size, having the dorsal belt elevated instead of 
compressed, in its very deep notch, less proportional width and distinct auri- 
culations; from McCoy’s B. Urei (Brit. Pal. Foss., 554) in having the strise 
much narrower than the intervening grooves and not at all modified by the 
dorsal band, and in having the width of the aperture less than the diameter 
of the shell. Prof. Phillips’ figures differ in the absence of auriculations, and 
in the lateral strise. To Fleming’s original description I have not access. 
Bellerophon cyrtolites, Hall (13th Rep. N. Y. Reg., p. 107).—Shell sub- 
cuneiform, laterally somewhat appressed; whorls very rapidly enlarging, but 
slightly embracing; transverse section subcordate, broadest near the umbili¬ 
cus ; dorsum strongly but obtusely carinated; dorso-lateral slope nearly flat, 
sometimes slightly concave near the peripheral belt; sides regularly rounded, 
as well as the umbilical slope; umbilicus moderate, exposing only the last 
volution; notch deep, pointed, moderately broad. Entire surface of shell 
ornamented with fine, sharply raised tranverse striae, which curve backwards 
upon the side, and meet upon the dorsum in an angle of about 60 g . The 
umbilical region and the sides are equally marked by fine longitudinal striae, 
which disappear in the vicinity of the keel. 
The largest specimen seen measures across the outer whorl *41 (100) ; height 
of aperture *23 (56); transverse diameter of aperture *19 (46), with about 
13 longitudinal and 13 transverse striae in one-tenth of an inch, counted on 
the dorso-lateral slope near the aperture. Another specimen with shell better 
preserved has 10 transverse striae in the same distance. 
Locality. —Moscow, Hillsdale county. 
The side view and section of this species are not unlike those of B. com- 
[Sept. 
I 
