OF DENISON UNIVERSITY. 
99 
better understood, and the following description represents the present 
knowledge of the same. 
Glabella trilobate. The middle lobe broadly rounded anteriorly, 
laterally deeply incurved and almost parallel, posteriorly produced on 
either side something like an apothecary’s pestle. Lateral lobes long, 
sub-reniform, lying against the incurved portion of the mesial lobe, 
bending about the pestle-like base of the latter. Palpebral lobes reni- 
form, the convex side turns outwards, the anterior part attenuated, the 
inner side depressed and defined from the fixed cheeks by a groove 
more or less distinct. Fixed cheeks between the eyes and glabella are 
ovate in form, at the base, however, they extend laterally along the 
posterior part of the head, the facial sutures cutting the posterior mar- 
gin of the same. Between the fixed cheeks, the lateral lobes of the 
glabella, the tips of the mesial lobe, and the occipital ring, lie on either 
side small laterally extended tubercles, well defined by furrows. 
The hypostoma of this species is frequently found. The figure 
will readily enough distinguish the same. 
Locality and position. Brown’s Quarry, Soldiers’ Home Quarries, 
Fair Haven (a glabella), Clinton Group. 
Genus PHACOPS, Emmrich. 
X. Phacops pulchellus, sp. n. 
{Plate VIH, Fig. 4, 20, 21.) 
Arionellus , D. U. Bull., Vol. I, p. 114, pi. XIV, fig. 3, 
Head semi-circular, convex. Glabella convex and broadly round- 
ed anteriorly, narrowed posteriorly, marked by three sets of grooves, 
all of them curved, the convex side being directed upwards or inward. 
The first set consisting of two pairs of grooves are horizontal, the rest 
extending from the lateral terminations of the latter upwards and out- 
wards. In Dalmanites these pairs become confluent at the adjacent 
terminations and form the grooves distinguishing the anterior lobe of 
the glabella, so characteristic of that genus. The second set are also 
horizontal, the inner ends being directed slightly upwards. The third 
set separates the anterior portion of the glabella from the remainder, 
extending across the axis as an indistinct shallow groove. Between 
the third set and the well defined occipital furrow the glabella becomes 
suddenly depressed and compressed laterally, forming a sort of pedes- 
