96 PALEONTOLOGY OF THE EUREKA DISTRICT. 
Genus BARRANDIA McCoy. 
Barrandia ? McCoyi, n. sp. 
Plate xii, fig. 5. ; 
General form of glabella and fixed cheeks, exclusive of the extension 
of the postero-lateral limbs, subquadrate. Glabella oblong, widening out a 
little towards the broadly rounded front; general surface moderately con- 
vex, and unbroken by any glabellar furrows; occipital ring of average 
width; occipital furrow distinct, but not deeply impressed; dorsal furrows 
quite strong in the specimen illustrated, and less so in other examples; 
fixed cheeks of average width, broadest and most elevated at the eyelobes 
from which they slope to the front and back; eyelobes situated back of a 
line uniting their anterior margins with the center of the glabella; the 
front of the head is bordered by a narrow, flattened rim; postero-lateral 
limbs triangular, terminating at a distance from the dorsal furrow equal to 
one-half the length of the glabella exclusive of the occipital ring. 
Surface smooth to the unaided eye. 
After an examination of the various species referred to this genus by 
Mr. Salter, we find that the Eureka form differs from most of them in the 
more anterior position of the eyelobes and the stronger dorsal furrows; 
features that, without known differences in the thorax and pygidium to sup- 
port them, we do not consider of generic importance. As the parts de- 
scribed, however, are all that is known of the species, the generic reference 
is somewhat provisional for this and also the following species. 
Formation and locality—Pogonip Group, on lower eastern slope of ridge 
east of the Hamburg Ridge, Eureka District, Nevada. 
Barrandia? sp.? 
Plate xii, fig. 6. 
Glabella subclavate, the width of the base being about four-fifths of 
that of the anterior portion; front broadly rounded; general surface gently 
convex, curving down somewhat abruptly in front to the narrow, rim-like 
margin; occipital ring narrow and with a small tubercle at the center; 
occipital furrow shallow, but quite distinct; dorsal furrows clearly defined. 
