98 PALEONTOLOGY OF THE EUREKA DISTRICT. 
east of the Jackson mine; a little to the northeast of Adams Hill, and on 
ridge southwest of Wood Cone, Eureka District, Nevada. In the White 
Pine District, Nevada, it was found in the central portion of the Pogonip 
limestone on Pogonip Ridge. 
Genus ASAPHUS Brongniart. 
Asaphus Caribouensis, n. sp. 
Plate xii, figs. 7,74, b. 
General form of the head semi-elliptical, moderately convex; glabella 
expanding quite rapidly in front of the eyelobes and obtusely angular in 
front; eyelobes situated back of a line uniting their anterior margins and 
the center of the glabella; postero-lateral limbs short and triangular in out- 
line. The associated free cheek is a little longer than wide and with a dis- 
tinctly marked border and genal spine. 
The pygidiz occurring in the same hand specimens have a rather 
prominent medium lobe and smooth, depressed lateral lobes, without traces 
of segments on the latter. 
Formation and localities —Pogonip Group, in the lower portion asso- 
ciated with the preceding species, and also in the upper beds at the west 
base of Caribou Hill, Eureka District, Nevada. 
Asaphus? curiosa Billings. 
Plate xii, fig. 15. 
Asaphus ? curiosa Billings, 1865. Pal. Foss., vol. i, p. 318, fig. 305. 
This curious pygidium, which is so closely allied to that described by 
Mr. Billings under the above name, shows traces of annulations on the me- 
dian lobe when the outer shell is removed. Three specimens were obtained, 
but no associated parts of the head or thorax. 
Fragments of two other species of Asaphus occur in the upper layers 
of the Pogonip Group. One from Caribou Hill has a broad, smooth, planu- 
late pygidium with a very small and short median lobe, and is unlike any 
species known from American strata, being allied to some forms, described 
by Angelin, from Sweden. The other species is related to A. Caribouensis 
