230 A. Winchell on Fossils from the 
lobes, a furrow passes quite across the glabella, being curved 
backward in the middle. Behind this is another nearly parallel 
furrow, and in front is a pair of faint furrows situated nearly op- 
posite the anterior extremity of the palpebral lobe, and eac 
traceable about one-third the distance across the glabella. An 
other glabella, very similar to this, shows three transverse fur- 
rows, besides the anterior interrupted furrow. 
A finely preserved pygidium presents a strong convexity, 
especially in the middlelobe. Aside from the marginal flap, the 
external outline is nearly semicircular, with the anterior margin 
considerably curved. The lateral lobes are strongly convex, be: 
coming less so nearer the border, and abruptly joining the cal 
dal flap, at an inclination of about 45°. The pleure are furrowed 
in such a manner that there seems to be an accessory pleura 0 
tween each two principal ones. The articulations are seven i0 
number in both the axial and side lobes, and extend nearly 10 
the terminal apex of the middle lobe. The caudal flap is fat, 
and about as wide as the middle lobe at its anterior end, au 
marked uniformly through its whole length by eight or more 
rigid concentric striz. No indications of caudal spines. 
_ This pygidium was originally referred to this species on sue 
information as was accessible, amongst which was Hall’s figure 
in the Wisconsin Report (p. 22, fig. 4), showing indications of & 
previously been described. 
Prycnasris BaRaBUENSIS, 0. Sp. 
The collection embraces some fragments of the cephalic and 
caudal shields of a large trilobite, which, while its generic rel 
tions are somewhat indeterminate, has a certain expression which 
is peculiar. The head is about 2°4 inches broad, and rather co® 
vex; the thickened and convex margin of the border is separe 
ted from the glabella by a narrow, concave furrow, giving the 
border a width of three-tenths of an inch. Posteriorly, the bor 
epee borders of the cheek. ‘The surface is feebly eee 
ate-wrinkled; though with oblique light it is seen to be tai 
tinctly so, and the character is even better shown with a 10" 
magnifier, though the cast is preserved in sandstone. 7 
_ The pygidium which undoubtedly belongs to the same oh 
cies is 2°9 inches across, and three-fourths of an inch in _ 
The middle lobe is nine-tenths of an inch across, and 18 4 
