94 PALEONTOLOGY OF THE EUREKA DISTRICT. 



ceptible, depressed, narrow rim in front of the glabella and fixed cheeks; 

 postero-lateral limbs unknown. 



Surface of glabella minutely granulose. 



This species, although founded on a glabella but 4 mm in length, is 

 clearly distinguished from any described form by its almost obsolete frontal 

 margin and the conical outline of the glabella. 



Formation and locality. Pogonip Group, on the eastern slope of ridge 

 east of the Hamburg Ridge, Eureka District, Nevada. 



Genus AMPHION Pander. 



Amphion Nevadensis, n. ap. 

 Plate xii, fig. 13. 



Glabella subquadrangular, slightly convex, sides parallel, front broadly 

 rounded ; surface marked by three pairs of furrows, the two posterior pairs 

 extending obliquely inward about one-third the entire distance across; 

 anterior pair shorter and situated so far forward that the anterior lobe is 

 somewhat irregularly rhomboidal in outline; occipital segment strong, flat- 

 tened; occipital furrow narrow and like the dorsal furrows, deeply impressed; 

 fixed cheeks known only in part; they are narrow in front, increasing in 

 width at the eyelobes, and extending backward to the broad strong postero- 

 lateral limbs; the latter are strongly marked by the continuation of the 

 occipital groove within the posterior margin. 



Surface granulose as far as can be determined from the specimens, 

 which owing to exposure are somewhat imperfect. 



Formation and localities. Pogonip Group, upper portion, on the south- 

 east slope of Bellevue Peak, Fish Creek Mountains, Eureka District, 

 Nevada; Amphion Nevadensis also occurs in the Upper Pogonip limestone on 

 the north end of Pogonip Ridge, White Pine District, Nevada. 



Two pygidise occur at other localities, which may be referred to this 

 genus. They belong to different species, but without the head parts a 

 specific determination or name would be of little value. 



