OF DENISON UNIVERSITY. 
Ill 
postero-lateral edge of the head. Palpebral lobe fairly prom- 
inent. Fixed cheeks provided with a very deep and broad fur- 
row close to the posterior margin, following its direction. Movable 
cheeks with thick, rounded lateral margins, defined by a distinct, 
rounded, lateral furrow, above which the remaining portion of the 
cheek is decidedly elevated. The curvature of the anterior and lat- 
eral margins of the head is quite regular, with the exception of a slight 
more or less evident inward curvature just behind the origin of the fa- 
cial suture. 
Thorax not entirely preserved, the number of articulations not 
known. Central lobe of the articulations elevated above the lateral 
lobes, more arched than the lateral lobes, separated from them by a dis- 
tinct longitudinal furrow. Segment of the middle lobe arched forward 
along the middle, also bent a little forward at the sides, where they 
show a low, nodal thickening. The grooves separating the segments 
deeper at the sides, leaving a sort of axis along the centre of the middle 
lobe. The articulations of the lateral lobes extend laterally for a short 
distance and then are deflected posteriorly to their ends. A longitudi- 
nal furrow extends along each articulation dividing off its anterior part 
by a deeper and broader furrow than that which separates the articu- 
lations from each other. 
Width of the head, about 64 mm.; length, 30 mm. Width of the 
glabella across the posterior lobes, 21 mm.; length, not including the 
neck segment, 19 mm.; including the same, 24 mm. Distance be- 
tween the points of union of the facial sutures and the lateral margins, 
19 mm.; forward extension of the anterior border, 6.5 mm. Proba- 
ble length of the entire specimen, 105 mm. 
Locality and position. Allen’s Quarry, Clinton Group, in the up- 
per shaly course. The specimen crumbled partially away on re- 
moval. 
Fragments of glabellae and surrounding portions belonging to this 
species are found at the Soldiers’ Home Quarries, also near the top of 
the group, in the upper shaly courses. Associated with these are 
pygidia, which seem to belong to this species, the connection is, how- 
ever, rather conjectural than otherwise. 
Pygidium wider than long, the posterior edge making a very broad 
curve, almost straight along the middle. The anterior and lateral 
margins as far as preserved having an almost semi-circular outline. 
Middle lobe rapidly tapering posteriorly, segments about eight, the tip 
