50 PALEONTOLOGY OF THE EUEEKA DISTRICT. 



its length from the marginal furrow; laterally it passes into the strong- 

 rounded border of which it is an extension. 



Glabella strongly convex, broadly conical in outline and rounded 

 truncate in front; the greatest breadth near the base is five-sixths of the 

 length from the occipital furrow to the front; three pairs of furrows divide it 

 into three posterior subequal lobes and one smaller anterior lobe; the poste- 

 rior furrows penetrate obliquely backward nearly two-thirds the distance to 

 the median line, while the two anterior pairs are short and but slightly im- 

 pressed; occipital furrow broad and well defined, with a small triangular- 

 shaped node at each postero-lateral^ angle of the glabella; occipital ring 

 strong and narrowing towards the dorsal furrows. Only small portions of 

 the fixed cheeks are preserved; these show the presence of strongly-defined 

 dorsal furrows around the glabella, and that the cheeks sloped up rapidly 

 from them towards the palpebral lobes, which, from the associated free 

 cheek, must have been of rather large size and not far from the glabella, 

 giving a somewhat narrow fixed cheek; the anterior limb has a length of 

 about one-fifth of that of the glabella from the occipital furrow, it is slightly 

 convex and slopes into the rather strong furrow between it and the nasute-- 

 like extension of the marginal border, its anterior margin forming an obtuse 

 angle at the median line. 



The associated free cheek is subtriangular in outline, strongly convex, 

 with a wide, strong marginal border and groove, and a spinous extension 

 of the genal angle, with the anterior margin extended beyond the union of 

 the cheek with the margin, the interior angle is hollowed out for the recep- 

 tion of a large eyelobe. 



Surface granulose and probably pustulose on the glabella. 



This is a large and unusually striking species. In the extension of the 

 frontal border it is like Anomocare acuminatum Angelin, a feature not here- 

 tofore observed in any American species from this horizon. 



Formation and locality. Summit of the Cambrian, Prospect Mountain 

 Group, east side of the canon east of the Hamburg Ridge, Eureka Dis- 

 trict, Nevada. 



