222 rALiEONTOLOGY. 



size from below upward. Occipital furrow narrow, not extending entirely 

 across the lobe; occipital ring narrow, flattened on the outer ends, and 

 marked by a node-like tubercle in the center. 



Fixed cheeks broad in proportion to the size of the glabella; palpebral 

 lobes large, rapidly rising from the margin of the glabella to the border of 

 the eye; lateral limbs of moderate size, and, judging from the direction of 

 the sutural margin of the movable cheek, have been short, and rapidly slop- 

 ing, with an almost direct line, from the posterior angle of the eye to the 

 posterior border of the head. Frontal limb excessively expanded, and form- 

 ing about three-fifths of the entire length of the head, including the occipital 

 ring. From the front of the glabella, the surface rises gently for a distance 

 equal to the width of the anterior end of the glabella, and beyond is grace- 

 fully and gently concave to the anterior margin, where it has been bordered 

 by a double rim. The rising surface in front of the glabella is distinctly 

 marked by fine, irregular lines, or striae, radiating from the edge of Ihe gla- 

 bella. Ocular ridges well pronounced, rising from the sides of the anterior 

 lobe of the glabella, and passing with a slight upward curvature to the ante- 

 rior angle of the eye-lobes. Eyes not observed. 



Movable cheeks very large and wide, irregularly triangular in outline, 

 the posterior angle projecting backward in the form of a broad, short, flat- 

 tened spine; outer margin gently arcuate; anterior margin, forming the 

 facial suture, slightly concave to near the eye, where it becomes slightly 

 recurved.' Ocular sinus large. Surface of the cheek gently concave from 

 the eye to the outer border, and marked by a low, rounded ridge parallel 

 to the margin at a little more than one-third of the entire width from the 

 eye. Continuation of the occipital furrow very faintly marked. Upper sur- 

 face of the cheek marked by fine, closely-arranged, irregular striae, nearly 

 parallel with the margin. Under surface more strongly and distantly striated. 



Thorax known only by a part of a single articulation, associated with 

 the other parts in the same fragment of rock. The fragment consists of a 

 right pleura, and is of moderate width, with parallel margins slightly recurved 

 throughout its length, and more abruptly near the free extremity. The 

 surface is characterized by a very broad, shallow furroAV, occupying nearly 

 the entire width, and becoming obsolete near the end of the rib. The ante- 



