GEOLOGICAL SUEVEY OF THE TERRITORIES. 485 



moderately arciiatej and ranging parallel to each other, and to the 

 longer axis of the glabella, their posterior ends extending back nearly 

 as far as the position of the neck furrow. Facial suture starting from 

 the anterior ends of the eyes, close in to the dorsal furrows and diverg- 

 ing forward to the transverse furrow of the anterior extension or limb, 

 where they are a little wider apart than the widest portion of the 

 glabella, while beyond this they appear to curve a little inward as they 

 approach the anterior margin. Posteriorly they curve parallel to the 

 posterior margins of the cheeks, as far as they have been traced. Sur- 

 face smooth. 



Length of cephalic shield, 0.90 inch ; length of glabella,' exclusive of 

 neck segment, 0.53 inch ; length including same, 0.65 inch ; breadth of 

 glabella at widest part, 0.45 inch ; length of palpebral lobes, 0.33 inch. 



I refer this species merely provisionally, for the present, to the group 

 Asajjhiscus,* because I am only acquainted with it in the condition of 

 fragments. Its glabella is slightly more convex and rather decidedly 

 less conical than in the type of that group ; while its eyes are larger 

 and closer in to the dorsal furrows defining each side of the glabella, 

 and its neck furrow narrower and rather more sharply defined. There 

 may be more important differences in other parts, if we had the means 

 of comparison ; but as those mentioned seem to be all such as may be 

 merely specific, it most probably belongs to the group. 



At a first glance this species reminds one of the figure of BatJiyurus 

 capax, Billings, which was also founded upon the corresponding parts 

 of the head. It may be at once distinguished, however, by the greater 

 extension of its anterior margin in front of the glabella, as well as by 

 its larger palpebral lobes (and consequently the eyes akso) being situated, 

 farther back, and much closer inward to the sides of the glabella. 



Locality and position. — Near Malade City, Northern Utah, Quebec 

 group of the Lower Silurian. 



Co]vtocoe,yph:e (Ptychoparia) Gallatinensis, Meek. 



Cephalic shield approaching semicircular. Glabella conical-subovate, 

 nearly three-fourths as long as the cephalic shield, widest just in 

 front of the neck furrow, where its breadth about equals four-fifths of 



* This group is founded on AsapMscus Wheeleri, a new species discovered by Lieu- 

 tenant G. M. Wheeler, of United States Topographical Engineers, in the primordial 

 rocks near Antelope Springs, Utah. It is nearly allied to Batlujurellus, Billings, and 

 will, it is thoujrht by that gentleman, include a part of the species referred hy him 

 provisionally, from imperft-ct specimens, to the same. It differs, however, from the 

 typical forms of that genus, in having its coni-cal glabella deddedhj depressed, and the 

 margin of the head in front of ii, first convex and sloping forward into a deep trans- 

 verse mesial farrow, then rising in the form of a convex margin to the front. The 

 mesial lobe of its pygidium is also proportionally longer, and the free margins of the 

 same much narrower and less flattened and alate. It probably only forms a subgeni^s 

 under Bathijurellus. From Asaphus, with which it agrees in general form and propor- 

 tions, it differs in its decidedly conical, well-defined glabella, without lateral furrows 

 or lobes, the extended and transversely furrowed character of the anterior margin of 

 its head, its less arcuate eyes placed more remote from the glabella ; and particularly 

 in having nine body segments, instead of only eight. As in Asaphus, >ts pleuras are 

 distinctly furrowed, but they are more pointed than is usual in that genus, though not 

 falcate. Its surface is smooth. 



The generic and specific characters will be given in full, with illustrations, in 

 Lieutenant Wheeler's Report. 



Several American species with a similar depressed, conical glabella, without traces 

 of lateral furrows or lobes, have been described from more or less complete specimens 

 of the head, under the name Conoceplialltes. It is evident, however, from its smaller 

 nuniber of body segments, large pygidium, and differently formed plural grooves, that 

 Asajyhiscus is entirely distinct from" that group. 



