from the Coal-measures of Iilinois. 23 
there originates a distinct mesial furrow, that extends forward 
to near the middle of the shield, where it is intersected by two 
oblique furrows, with the prominence for the mesial ocelli be- 
tween them. ‘T'wo other deep lateral furrows extend, one on 
each side, from the posterior end of the mesial one, obliquely 
outward near the posterior margin. The surface is ornamented 
th j ; : 
at the point. Palpi unknown, Legs stout, long, with long 
joints gradually decreasing in breadth, and apparently like all 
the other parts, without hairs, serrations or spines, 
he abdomen is a little more than twice the aly length 
n 
Of the tail, only the anterior three segments are preserved in 
of division, but is incomplete at both ends, ; 
