28o 



NORTH AMERICAN INDEX FOSSILS. 



XXVIIA. Parabolinella Brogger. 



This subgenus differs from Pardbolina in that the glabella is 

 shorter and broader; the eyes are farther back; the pygidium is 

 small, without marginal notches or spines. 



64. P. (Parabolinella?) quadrata Matthew. Cambric. 



Differs from P. spinulosa in the more convex outline of the 



anterior part of the cephalon; in the greater distance (4.5 mm.) 



Fig. 1 58 1, a, l>, Peltura scarabeoides, enlarged; c, d, Ctenopyge pecteUy cephalon 

 and pygidium, both X f » ^Si Sphceropthalmus Jietcheri ; e, front view of cephalon and 

 free cheek ; f, side view of cephalon ; g^ pygidium ; all much enlarged. (After 

 Matthew. ) 



between the subtruncate anterior part of the glabella and the 

 marginal rim; the eye lobes anterior to the middle of the glabella 

 and opposite the faint anterior (third and fourth) glabellar fur- 

 rows. The glabella is widest anteriorly and narrowest at the 

 posterior furrow. Posterior and second furrows deeply impressed 

 in the outer third but not reaching the margin of the glabella. 



