50 
PALEONTOLOGY OF NEW YORK. 
Y\ie facial sutures take their origin at points on the lateral margins about 
one-third the distance from the angles of the cheeks to the anterior extremity, 
and are normal in their direction. 
Glabella sub-clavate or elongate sub-pentagonal, extending to the frontal 
margin. Length and width nearly equal. Longitudinal furrows deep. 
Anterior lobe sub-rhomboidal, wider than long. Surface gently and evenly 
convex, sloping somewhat more rapidly anteriorly than laterally. First 
lateral furrows oblique and extending nearly across the glabella, second and 
third furrows transverse and short. First and second lateral lobes short and 
elevated, third lobes narrow and annular. The axial portion of the glabella 
behind the anterior lolje is rounded and depressed. Occipital furrow narrow 
and moderately deep, becoming more conspicuous upon the cheeks ; occipital 
ring broad and elevated upon the axis, being very narrow upon the cheeks 
close to the axial furrows, but rapidly widening toward the genal extremities. 
Cheeks moderately broad, flattened and strongly sulcate about the base of 
the eyes; abruptly deflected laterally. 
Eyes prominent, elevated above any other portion of the head. Visual 
surface broad, lunate ; lenses'numerous. Palpebrum not prominent; palpebral 
lobe very depressed. 
Thorax sub-quadrate, somewhat wider than long. Surface depressed-convex, 
deflected at the sides. 
Axis narrow anteriorly, widening to the sixth segment, thence backward 
rounding and tapering rapidly to the pygidium. The segments are broad 
and flat or gently convex, with an anterior curve over the axial line. 
Pleurce moderately broad, flat along the axial furrows for more than one- 
half their width, thence deflected more or less abruptly. Each annulation is 
conspicuously sulcate, the anterior limb being as broad at the fulcrum as 
the posterior limb at its widest point. 
Pygidium. General outline sub-triangular or sub-semielliptical. Surface 
depressed above, lateral slopes more or less abrupt. Border narrow; post- 
axial area flat, bending slightly upward and bearing two slender divergent 
