Foerste.] 
288 
[May 1, 
The cast figured by Hall under Bucania stigmosa, figs. 8 c, d, e, 
PL 28, Pal. N. Y. Yol. n, is identical in form and size with our speci- 
mens. Figs. 8 a, b, of the same plate, and forming the type of B. 
stigmosa differ from our specimens in the possession of a low mesial 
carina, and apparently also in the shape and rate of increase of the 
shell, but this cannot be definitely determined at present since the 
type specimen is crushed and no perfect specimens of this form 
have been seen. The type specimen has a slit band identical in 
all characteristics with the Ohio specimens except in the fact that 
it is elevated on a carina. The same number of longitudinal striae, 
the same angle with the carina among the lateral striae, and the 
same wavy or curly structure among these striae are found in B. 
stigmosa as in B. Jiscello-striatus. 
As a rule the mere elevation of the slit band into a carina is not 
sufficient to distinguish a species. The same would also be true 
in this case but for the fact that in three localities as far distant 
as Brown’s Quarry, Soldiers’ Home, in Ohio, and Hanover, Indi- 
ana, no carina has been found. Until the carinated New York 
species is shown to be similar in form with the uncarinated type, 
it seems possible to distinguish these forms as species. 
Bellerophon (Bucania) exigua, Foerste. 
(plate VI, FIG. 3.) 
The Ohio types of this species were only internal casts. The 
Hanover, Indiana, specimen presents the same features, and in like 
manner develops no carina except a faint indication of one along 
the last three-fourths of the last coil. Its greatest diameter is 
15 mm., the least diameter of the coil is 12 mm., and the width at 
its mouth was at least 11 mm., but the aperture has been broken 
away. The only Bucania known to me from the western Clinton 
which preserves its exterior markings is a single imperfect speci- 
men from the Todd’s Fork section near Wilmington, Ohio. The 
diameter of this specimen is at least 15 mm., but at a small distance 
above the aperture it has a diameter of 14 mm. In this specimen 
the carina however is not so indefinite but is seen to be more angu- 
gular along the median line. Only transverse striae are present. 
These are low and more of the nature of undulations, three in a 
length of 3 mm. toward the mouth. The striae bend backwards in 
passing over the carina, and meet at an angle of perhaps 135°. 
