216 
AUG. F. FOERSTE 
35. Ceraurinus cf. trentonensis Barton 
Glabella expanding anteriorly; in one cranidium 12 mm. long, 
the width of the glabella increases from 8 to almost 10 mm. 
from the rear toward the front. The general form of the glabella 
is depressed convex, and is distinctly limited laterally by the 
relatively shallow dorsal furrow. The first and second pairs of 
glabellar furrows are distinctly curved ; from the dorsal furrow 
they curve gently forward and then, for a longer distance, back- 
ward, the inner ends terminating farther back than their outer 
ends. The third or posterior pair of glabellar furrow^s is directed 
diagonally backward, at an angle of about 55 degrees with the 
median line of the glabella, joining the occipital furrow at points 
only 2 mm. distant from each other. The posterior pair of 
glabellar lobes is distinctly triangular. The first and second 
pairs of glabellar furrows are narrow and sharply incised. The 
surface of the glabella is almost smooth or minutely granulated. 
On the fixed cheeks minute pits may be detected. In general 
appearance, these cranidia resemble those of Cheirurus in which 
the posterior pair of glabellar furrows is strongly defined as far 
as its connection with the occipital furrow (Ohio Jour. Sci., 19, 
1919, p. 396, pi. 19, fig. 7). . 
Found at locality 4 on Sanders branch, in the Kimmswick 
limestone. 
In general aspect this species resembles Ceraurinus scofieldi 
(Clarke) from the Platteville at Minneapolis, Minnesota (plate 
XXII, fig. 19, of this bulletin), but the first and second pairs of 
glabellar furrows in that species are less distinct and less curved. 
36. Ceraurus cf. bispinosus Raymond and Barton 
Plate XXI, figs. 18 A, B, C 
The dorsal furrows limiting the sides of the glabella diverge at 
angles between 22 and 27 degrees in different specimens. All 
of the glabellar furrows are strongly indented. The eyes are 
nearly opposite the second pair of glabellar furrows or slightly 
farther forward. They are about equally distant from the 
