92 PALEONTOLOGY OF THE EUREKA DISTRICT. 
furrow rather broad and strongly impressed; fixed cheeks of average width, 
sloping upward from the strongly marked dorsal furrows to the eyelobes, 
falling away to the front and back; frontal limb curving abruptly down- 
ward to a strong rounded rim-like margin; postero-lateral limbs strongly 
marked by a furrow within the posterior margin. 
Surface of glabella and fixed cheeks ornamented with pustules, finely 
granulose in the narrow interspaces. 
This species is characterized by the pustulose surface of the head. No 
remains of the thorax or pygidium were observed in association with the 
head parts. 
Formation and locality—Pogonip Group, on the ridge southwest of 
Wood Cone, Eureka District, Nevada, and at the same horizon on the north 
end of Pogonip Ridge, Eureka District, Nevada. 
Bathyurus ? congeneris, n. sp. 
Plate xii, fig. 8. 
Compare Bathyurus ? serratus Meek, 1873. Sixth Ann. Rep. U.S. Geol. Sury. Terri- 
tories for the year 1872, p. 480. 
General outline of glabella and fixed cheeks, exclusive of the postero- 
lataerl limbs, subquadrangular and rather strongly convex. Glabella ob- 
long, sides nearly parallel, and front rounded. Occipital ring of moderate 
width, and separated from the glabella by a narrow, well-impressed furrow; 
dorsal furrows narrow but well defined on the sides and in front of the gla- 
bella; fixed cheeks of medium width, somewhat depressed below the level 
of the glabella; frontal limb as a narrow, rounded rim; postero-lateral limbs, 
extended laterally and with a narrow furrow within the posterior margin. 
Surface finely granulose. 
An illustration is given of the pygidium associated with the glabella 
and fixed cheeks, plate xii, fig. 8 a. 
This species is closely allied to Bathyurus ? serratus Meek, and Bathy- 
urus oblongus Billings (Pal. Foss., vol. i, p. 411, fig. 394, 1865), the chief 
difference between them being in the details of the frontal limb. They are 
