— Ill — 



The mandible is an extremely solid and thick bone, 

 with Pleurodont dentition, and with the alveolar edges 

 far apart. In the least fragmentary example the entire 

 dentary and part of the articular have been preserved ; 

 but the articulary surface has been broken away, so that 

 we remain ignorant as to the form of the joint and the 

 part behind it. The dcntanj is 37 millims. long, 12 milliins. 

 high beliind, and 7 milHms. thick in its middle. Its outer 

 surface is very convex, smooth, perforated in its anterior 

 half by a series of five foramina mentalia. It rapidly 

 tapers in front, and is moderately deeply cleft behind for 

 the reception of the articular bone. The junction between 

 the two bones is very close, without vacuity or foramen 

 on the outer surface. The splenial consiste of two pieces, 

 the anterior fitting into the deep inner notch of the den- 

 tary, participating in the formation of the inner foramen ; 

 the posterior piece is small, and, barely touching the 

 dentary, lies along the lower side of the articular ; it 

 terminates interiorly in the perpendicular from the coro- 

 noid process. The corotwid is small, its process not quite 

 vertical to the longitudinal axis of tlie mandible. 



The teeth were closel}^ set, small, about 24 in number ; 

 the anterior were probably conical and pointed, but the 

 posterior, of which several are preserved, have very obtuse 

 summits. 



Shafts of three hujiien have been preserved, one with 

 the distal end complete, and another with a portion of the 

 proximal extremity. This bone does not appear to differ 

 from the type of other Pleurodont lizards. It is about 

 39 millims. long, with a thin and slightly compressed 

 shaft, with the ulnar tuberosity dilated and much pro- 

 jecting, and with the radical margin compressed into a 

 sharp edge above the condyle ; the supracondylar foramen 

 perforates this sharp edge, just above the condyle. The 

 distal extremity is 13 j millims. broad. 



