OF DENISON UNIVERSITY. I09 
Usually in the form of casts, surface where preserved apparently 
striated concentrically, at least around the edges, and dotted with small, 
shallow pits. 
Locality and position. Soldiers’ Home and vicinity. Clinton Group. 
Abundant. 
GENUS CALYMENE, Brongniart. 
VI. Calymene . • 
I^Plate XIII, Fig. 24.) 
Portions only of the head found, as fragments ; the figure partly a 
restoration effected by a comparison of numerous fragmentary speci- 
mens. A fuller description will be given in the next paper if better 
material be found. 
Glabella more prominent than the cheeks, very strongly defined 
from them by a deep, flat, longitudinal depression, which extends from 
the tip of the middle lateral lobe forward, forming an almost straight 
line along the line of separation from the fixed cheek, and terminating 
near the anterior end of the glabella, the side towards the fixed cheek 
being somewhat pointed. A similar depression behind the middle 
lateral lobes separates the posterior lobes from the surrounding portions 
of the head, its curvature being about that of the margins of the pos- 
terior lobes. The anterior border of the head is broad and flat, and 
directed upwards, with no arching along the middle as in specimens of 
Calymene Niagarensis. The anterior rim of this border has a slow 
curvature, appearing more like a straight line in some specimens than 
any species I am acquainted with. In other specimens, however, 
there is a somewhat greater curvature to the anterior rim. The fa- 
cial sutures beginning with a slight outward curve for a small distance 
become almost parallel to each other as far as the eyes (which I now 
believe are incorrectly indicated in the drawing). Occipital furrow 
and as much of the fixed cheeks as is preserved, seem similar to the 
corresponding regions of C. Niagarensis. 
Measurements are not given, on account of the unsatisfactory con- 
dition of the specimens. The figure is based upon a specimen pre- 
serving the glabella, anterior border and portions of the fixed cheeks, 
(all of the cheek anterior to the middle lateral lobe on one side of the 
glabella.) The rest of the figure is the result of comparison. The 
description is given mainly to note the existence of a form which has 
