MR. T. ATTHEY ON ANTHRACOSATJRUS RT7SSELLI. 315 



the same side of the cranium, as was noticed in the description 

 of the upper cranial surface. 



Owing to the absence of this portion of the palate-bone, with 

 a portion of the corresponding pterygoid, from its natural site, a 

 portion of the left orbital vacuity can be seen through from 

 below ; also the under surfaces of the lacrymal, prefrontal, and 

 jugal bones can be seen united by their sutures. On the right 

 side, a good many of the posterior teeth of the maxilla are in 

 situ, and parallel to them are seen the teeth of the posterior 

 division of the palate-bone. On this side, also, a small portion 

 of the orbital vacuity is seen through from below, and the under 

 surface of its inner margin is well denned. 



The supratemporal arch of the right side shows part of the 

 under surface of the supratemporal and the whole of that of the 

 quadrate-jugal bone, the sutures of which are nearly all, on both 

 sides, determinable. That portion of the surface of the vomer 

 and pterygoid bones which has been preserved is covered all 

 over with small, pointed, and closely-set tubercles, while, on 

 the other hand, the palate-bones are deeply pitted. 



The general surface of the palate has been disrupted along the 

 median line by the pressure to which the skull has been sub- 

 jected, thus leaving exposed the greater part of the sphenoid 

 and presphenoid bones, the fissures extending forwards from the 

 junction of the sphenoid with the presphenoid to a point a little 

 in advance of the position of the palatal tusks. 



The palatine foramen found in Archegosaurus, Trematosaurus, 

 Mastodonsaurus, etc., is altogether wanting in Anthracosaurus, 

 and also in Loxomma. 



The premaxillaries are strong, and the bone on the left side is 

 well preserved, showing three teeth, all broken off at their 

 apices. The tooth (or, rather, what remains of it) that is next 

 to the symphysis, and the third from it, are each four-tenths 

 of an inch long ; the second is two-tenths of an inch ; they are 

 equidistant from each other. The right premaxillary teeth are 

 hidden by the posterior part of the right mandible lying over 

 them. The teeth, when entire, could not have measured more 

 than six-tenths of an inch in length. 



