FOSSILS OF THE CAMBRIAN. 25 
This is a very striking and pretty species, and is not liable to be mis- 
taken for any described American form, and it appears to be distinct from 
any European species known to me, although allied in a slight degree to 
Agnostus princeps Salter. 
Formation and localities—Cambrian. Prospect Mountain limestone, 
upper portion; Ruby Hill, Richmond mine, 700-foot level; and east slope 
of the northern portion of Prospect Mountain, Eureka District, Nevada. 
Agnostus seclusus, n. sp. 
Plate ix, fig. 14. 
Cephalic shield strongly convex, a little longer than wide, with a slight 
contraction posteriorly and margined by a narrow, rim-like border that has 
a distinct groove between it and the lateral lobes; dorsal furrows well 
defined, united anteriorly, but not dividing the lateral lobes in front, pos- 
teriorly each turns obliquely outward, a short distance from the margin, 
cutting off the inner angle of the lateral lobes Glabella short about one- 
half the length of the shield, strongly convex and squarely truncated in 
front; at about the anterior third a broad, short furrow penetrates on each 
side a short distance, and posteriorly a rounded node is separated from 
each lateral angle by slight furrows; the lateral lobes slope rapidly to the 
marginal groove on the sides and more gradually to the front. 
Surface finely granulose. 
Dimensions.—Length, 3""; breadth, nearly the same; depth of shield, 
1.257. 
Thoracic segments and caudal shield unknown. 
This species is characterized by the tumid, short, truncated glabella 
and broad lateral lobes. 
Formation and locality—Cambrian. Prospect Mountain Group; upper 
portion Secret Cafion shale, on the east side of Secret Cafion, Eureka Dis- 
trict, Nevada. , 
