FOSSILS OF THE CAMBRIAN. 59 
the eyelobes; marked near the posterior margin by the extension of the 
occipital groove. Facial suture extends outward, with a slight curvature 
in front of the eyelobe, and then recurves, rounding the lateral extension 
of the frontal limb; behind the eye it extends backward and outward at an 
angle of about 45° for a short distance, and then continues at an angle of 
25° to the posterior margin of the head. 
Dimensions.—Length of head, 6"; breadth of frontal lobe, 2.25™"; 
length of glabella, including occipital ring, nearly 3.75". 
This distinct form appears to belong to that division of the Concepha- 
lidze represented by Roemer’s genus Pterocephalus, judging by its wide 
frontal limb and the course of the facial sutures. 
Formation and locality—Upper beds of the Cambrian. On the east side 
of the canon east of the Hamburg Ridge, Eureka District, Nevada. 
Ptychoparia (Pterocephalus) laticeps H. & W. 
Concephalites (Pterocephalus) laticeps Hall & Whitfield, 1877. Geol. Expl. Fortieth 
Par., vol. iv, p. 221, pl. ii, figs. 4-7. 
This species is given by its authors as occurring in the lowest lime- 
stones on the west side of Pogonip Mountain, White Pine District, Nevada. 
In the Eureka District it is found in the upper beds of the Secret Canon 
shale, opposite the dump of the Richmond mine shaft, Ruby Hill, northeast 
side of the canon, and in the Hamburg belt of shale east of the Hamburg 
mine, Eureka District, Nevada. 
Genus ANOMOCARE Angelin. 
Anomocare ? parvum, n. sp. 
Plate ix, fig. 17. 
Glabella and fixed cheeks united, subquadrangular in form, moderately 
convex. Glabella tapering gradually from the base to the front, where it 
is rounded truncate; the surface is depressed convex and marked by four 
pairs of glabellar furrows, which are short, slightly impressed, and divide 
the glabella into three subequal lobes, with a somewhat longer anterior 
