114 
PALEONTOLOGY OF NEW YORK. 
Cephalon semicircular or semi-lunate in outline; border broad, flat and rounded 
at the 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; 
the 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 pine. 
