114 PALEONTOLOGY OF NEW YORK. 



Cephalon semicircular or semi-lunate in outline; border broad, flat and rounded 

 at (she edge ; widest in front and narrowing toward the genal angles, where it 

 is very faintly produced. Surface evenly convex. 



Facial Sutures normal, rapidly approximating on the frontal margin. 



Glabella broadly conate, constricted opposite the anterior angles of the 

 eyes. Surface depressed-convex. Length and greatest width about equal ; 

 tin anterior extremity scarcely reaching the marginal sulcus, the posterior 

 margin ending abruptly at the occipital furrow. The anterior and lateral 

 margins are bounded by shallow and inconspicuous furrows. Lateral furrows, 

 as shown upon the cast of the lower surface, in four pairs, accompanied by 

 the posterior accessory depressions. Of these furrows the first pair is very 

 short and transverse, the other three pairs and the accessory pair inclined 

 obliquely backward. The fourth pair is strong and reaches to the posterior 

 margin, but does not open into the occipital furrow. Upon the surface of 

 the test these lateral furrows would undoubtedly be less conspicuous, but no 

 specimen has been observed in which the crust of the glabella is retained. 

 Occipital lobes moderately strong ; occipital furrow narrow, impressed and 

 scarcely widening upon the cheeks ; occipital ring moderately broad, some- 

 what flattened and of about the same width along the posterior margin. 



Eyes relatively large and somewhat elevated above the surface of the gla- 

 bella. Palpebral lobe prominent; palpebral furrow shallow and inconspicu- 

 ous; orbital ridge well defined. 



Cheeks slightly depressed on the summit about the base of the orbital ridge, 

 and rounding over the very narrow lateral area to the broad and shallow 

 marginal sulcus. 



Thorax sub-rectangular, lateral margins nearly parallel, slightly approximating 

 posteriorly; length to width as 1 to 1.5. Surface convex, sub-equally tri- 

 lobate. Composed of ten segments. 



Axis evenly arched and gently tapering to the pygidium. Segments 

 rounded and somewhat flattened, transverse or with a slight anterior curve 

 over the axial Bine. 



