TRILOBITES. 749 
Conolichas cornutus.] 
Subgenus CONOLICHAS, Dames, 1877. 
CoNOLICHAS CORNUTUS #”. Sp. 
The specimen to be described was entire when found, but before coming into 
my hands, suffered from unskillful manipulation to such an extent as to obscure the 
lobation of the glabella and the segmentation of one side of the thorax. Notwith- 
standing, the condition of its preservation is much better than can usually be hoped 
for, in this group of fragile trilobites, for a Lichas with its parts in normal juxtaposi- 
tion is a rare occurrence. 
Cephalon transverse; narrowed and attenuate toward the lateral extremities; 
Figs. 72, 73.—Conolichas cornutus. 
greatly elevated axially. Length 11 mm.; width 31 mm. Glabella prominent; 
anterior margin the arc of an ellipse, projecting conspicuously beyond the general 
outline of the shield. The surface is convex, rising in a deep curve from the anterior 
margin to a well defined apex, marked by the base of a strong spine. This point is 
S$ mm. above the horizontal plane of the anterior margin. The lateral slopes of the 
glabella are less curved, and the posterior slope is long, straight or slightly incurved. 
The lateral and posterior lobes of the glabella are so obscured that only the delimi- 
tation of the former can be made out. It is evident that no middle glabellar furrow 
existed, but the anterior and posterior furrows were confluent and continuous. This 
furrow, originating on the anterior margin, rises nearly vertically along the sides of 
the glabella, making at first a slight inward curve, and, at about one-half the length 
of the median lobe, curving outward, terminating near or in the occipital furrow. 
The lateral lobes thus set off are large, though they were probably not greatly 
elevated, and represent the first and second lateral lobes of species in which the 
median glabellar furrow is developed. Whether the third or occipital lobes existed 
cannot be ascertained. Cheeks elongate and tapering; but slightly curved posteriorly 
toward their extremities. Where they unite with the glabella they are so much 
