31S 



two small pyriform basal lobes, bounded on all sides by 

 deeply-impressed furrows. Anterior lateral furrows obsolete. 

 Cheeks broad, granulose; eyes small, semi-Innate. Facial 

 sutures beginning near the genal angles, and in front of the 

 eyes diverging to the frontal margin. Thorax composed of 

 from ten to seventeen segments, which are rounded at their 

 extremities. Pygidium semi-circular, bearing from two to 

 eight annulations upon the axis." (Hall: Pal. X. Y., Vol. 

 VII., p. xlviii. ) 



Cyphaspis ornata. (Hall.) (Fig. 263.) (Pal. X. Y.. 

 Vol. VII., p. 145, Pis. XXL, XXIV. | 



Distinguishing I haracters. — Sub-ovoid glabella, about one- 

 half the length of the cephalon. slightly ele- 

 vated along the axial line: two isolated 

 pyriform lobes, cut off by baso-lateral fur- 

 rows: faint pustules on glabella: numerous 

 sharp tubercles on frontal area : frontal 

 border with a single row of bead-like 

 tubercles. 

 Found in the Hamilton group of Eigh- 

 (Hall. ) (Coll. Am. Mus. Nat. Hist. Xew 



Fig. 263. Cyphaspis 

 orriata. Portion of 

 cephalic shield, with 

 glabella, x 3 ( after 

 Hall). 



teen Mile Creek 

 York. ) 



