50 PALEONTOLOGY OF NEW YORK. 



The 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, 

 ami 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 furrow." 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 anil annular. The axial portion of the glabella 

 behind the anterior lobe 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. 



Pleura moderately broad, flat along the axial furrows for more than one- 

 hall' their width, theme 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. 



Pygtdium. General outline sub-triangular or sub-semielliptical. Surface 

 depressed above, lateral slopes more or less abrupt. Border narrow; post- 

 axial area Hat. bending slightly upward and bearing two slender divergent 



