WAVBRLY GROUP SPECIES. 325 



consideration would seem to be nearly related, in some of its characters, 

 to Phillipsia insignis, Winchell. In the description of that species, how- 

 ever, the presence of a row of nodes around the margin of the cephalic 

 shield is not mentioned, and its posterior lateral spines must be decid- 

 edly longer than in our species if I correctly understand the description, 

 in which they are said to "reach twice the length of the glabella from 

 the anterior end." In the arrangement of the tubercles on the glabella, 

 and in the possession of well-defined lateral lobes in the same. Prof. Win- 

 chell's species also seems to differ, as well as in its "large" eyes. There 

 would likewise appear to be much more important differences in the 

 pygidium, which in our species has the segments of the lateral lobes 

 distinctly continued across the somewhat flattened margin, and termi- 

 nating in little spine-like projections, so as to give the border a fimbri- 

 ated appearance, while in P. insignis they are merely said to "become 

 indistinct and disappear toward the margin." 



Locality and.positkm : In the Cuyahoga shales at Lodi, Medina county, Ohio, and in 

 ferruginous arenaceous beds of the Waverly group at Loudonville, Ohio. Lower Car- 

 boniferous. 



