392 The American Geologist. June, 1892 
AGNOSTUS RICHMONDENSIS Walcott, 1884. Platerx, fig. 11. 
Diagnosis.—Head moderately convex, length and breadth equal. 
Glabella 2 the length and a little more than } as wide at the base 
than the width of the head; elongate, conical in outline, 
strongly defined by the dorsal furrows, with the anterior third 
separated by a distinct transverse furrow; a little less than mid- 
way between this furrow and the posterior margin, a short. furrow 
penetrates from each side towards the base of a minute tubercle 
situated on the median line. Basal lobes small, triangular. 
Cheeks more convex than the glabella, separated in front of the 
glabella by a furrow. Limb narrow. Surface ornamented by 
slightly irregular depressed lines that indent the surface from the 
margin nearly to the edge of the strong dorsal furrows. Surface 
smooth under an ordinary magnifying power. 
Locality. Prospect mountain, Nevada. 
This species is identical with Agnostus americanus Billirgs. 
AGNOSTUS MALADENSIS Meek, 1873, aff. Agnostus josepha. 
The author proposes this name for a species from Malade City, 
Utah, which is closely allied to Agnostus josepha Hall, except that 
the specimens do not exhibit the spines on the genal angles of the 
head; the author remarks “none of which are in a condition 
to remove all doubt on this point.” 
Section LIMBATI. 
AGNOSTUS BIDENS Meek. Plate x, fig. 5. 
Diagnosis.—Head moderately convex, slightly wider than long, 
bordered by a rounded margin with a strongly defined marginal 
groove. Glabella convex, narrow, more than % the length of the 
head, converging anteriorly, sub-angular in front; two oblique 
furrows posterior to the center enter from each side, and unite 
just in advance of a small node, on the center of an elevation, de- 
fined behind by a transverse furrow that bends backwards; be- 
tween this furrow and the occipital furrow a narrow band extends, 
widening out laterally, forming the basal lobes. Dorsal furrow 
distinct. Cheeks convex and sloping rapidly to the marginal 
groove from the somewhat elevated central portion. Thorax un- 
known. The pygidium is armed with lateral spines, and is 
strongly convex. Axis conical, extending more than # of the en- 
tire length, ornamented with anelongated, angular tubercle on the 
