OF DENISON UNIVERSITY. 
103 
margin of the head. The posterior and lateral margins of the cheek 
are distinctly raised so as to form a ridge around the cheek. From 
the junction of the lateral and posterior ridge a long, sharp spine ex- 
tends almost directly backward, and a little downward. Along the 
lateral ridge of the cheek are arranged a number of short spines about 
one third as long as the postero-lateral spine. The lateral spines 
curve obliquely backwards. They are apparently almost equidis- 
tant from each other and decrease in length anteriorly. There is a 
lateral spine at the origin of the postero-lateral spine, from this point 
to a point opposite to the groove between the middle and anterior dor- 
sal furrow 10 spines may more or less distinctly be discerned. 
The general curvature of the head is semi-circular from side to side, 
the convexity from the anterior portion to the posterior of the head 
being far less, although the exact amount can not be determined on 
account of the imperfect preservation of the middle and anterior por- 
tions of the glabella. 
Surface, wherever preserved, distinctly pustulose. 
Probable length of glabella, 14 mm.; breadth of the same, 19 mm.; 
height of the middle part of the occipital margin above its lateral ex- 
tremities, 5 mm.; length of the lateral spines, 2.5 mm.; length' of the 
postero-lateral spine, 7 mm. Height of the preserved part of the 
glabella above the margins of the head, lo-ii mm. Probable width 
of the entire head, 25 mm. 
Locality and position. John Brown’s Quarry, New Carlisle, Ohio, 
from the collection of the Ohio State University, kindly loaned by Prof. 
Edward Orton. 
GENUS BATHYURUS, Billings. 
II. Bathyurus . 
(Plate XIV, Fig. 5.) 
Only a single fragment known, whose relation to this genus is rather 
conjectural. 
Glabella conical, convex, distinctly defined anteriorly and laterally 
by a continuous quite deep furrow. Posteriorly a small oval, almost 
triangular tubercle is inserted between the occipital furrow and both 
of the postero-lateral extremities of the glabella ; owing to these tubercles 
the outline of this portion of the head (the regions of the glabella) 
seems to broaden at their insertion and then to contract suddenly be- 
