486 GEOLOGICAL SUEVEY OF THE TERRITOEIES. 



its length, rounded anteriorly, rather distinctly convex, and well defined 

 by rather deep dorsal furrows that are continued around its front j 

 lateral furrows, (as seen in casts of the interior,) consisting apparently 

 of three to four pairs, the posterior pair starting at one-third to one-half 

 the length of the glabella in advance of the posterior side of the neck 

 segment, and ranging obliquely backward and inward, but not connect- 

 ing across the middle ;* succeeding furrows very obscure, or in part 

 (anterior ones) obsolete, short, and nearly transverse, or but slightly 

 oblique 5 rostral margin equaling about one-half the length of the gla- 

 bella, exclusive of the neck segment, sloping at first forward from near 

 the furrow around the front of the glabella to a deep, nearly mesial, 

 transverse furrow, from which it rises obliquely forward in the form of 

 a slightly convex, or somewhat flattened border, that is, a little arched 

 transversely ; neck segment arched so as to be nearly or quite as high 

 in the middle as the glabella ; neck furrow well defined entirely across, 

 but deepest on each side, and continued deeper, and sharply defined 

 across the posterior margins of the cheeks; fixed cheeks comparatively 

 wide, or more than half the breadth of the glabella near its middle, 

 rather distinctly convex, but lower than the glabella, bearing well-defined 

 ocular ridges that extend, with a slight curve, outward and a little, 

 obliquely backward from near the anterior end of the glabella to the 

 front of the eyes; free cheeks unknown ; palpebral lobes very narrow, 

 or only appearing as little raised rims on the margins of the fixed cheeks, 

 from which they are defined by small furrows. Eyes, as determined 

 from the palpebral lobes, about half as long as the breadth of the gla- 

 bella, from which they are rather remotely situated near their own length 

 in advance of the posterior margin of the cheeks, moderately arched and 

 somewhat converging forward. Surface nearly smooth, or only finely 

 granular. Other parts unknown. 



Entire length of cephalic shield, 0.43 inch ; breadth of cephalic shield, 

 unknown ; length of glabella, including neck segment, 0.31 inch; breadth 

 of glabella, 0.22 inch ; breadth across cheeks and glabella, between an- 

 terior ends of eyes, 0.46 inch. 



This species is evidently closely allied to Gonocoryphe (ConocephaJites) 

 teticre, Billings, and C. Billingsi, Shumard, but difi'ers from both leather 

 decidedly in not having the lateral furrows of its glabella curved back- 

 ward, the middle and anterior ones being nearly transverse, while none 

 of the specimens show any traces of the tubercle on the neck segments 

 seen in those species. Such a difference would also almost certainly be 

 found to be accompanied by others of equal or greater importance if 

 we had the means of comx^aring other parts. 



Among the associated specimens there are several others, consisting 

 of the glabella, fixed cheeks,' and rostral margin, that agree well with 

 the typical specimens of the species here proposed, excepting that they 

 have the glabella somewhat more convex, and the rostral margin in front 

 of its transverse furrow flattened and horizontal, or even slightly 

 "sloping forward, instead of a little convex, and rising obliquely forward. 

 The lateral furrows of the glabella in these are usually obscure, but 

 nearly as im the typical tbrm, excepting that I have not been able to 

 make out clearly more than three pairs. The fourth, or anterior, pair, 

 however, are exceedingly obscure, or nearly obsolete in the typical form. 



Another variety or species agrees with the last, excepting in showing 

 a few very scattering, much coarser, projecting granules over the sur- 



* Often there appears to be a small, obscure tubercle at the outer eud of each of the 

 posterior lateral furrows of the glabella, just within the dorsal furrows. 



