SKULL AND OTHER BONES OP LOXOMMA ALLMANNI. 203 



in front by the maxillaries and premaxillaries, and behind by 

 the bones next to be noticed. 



The quadrate jugals, oblong in shape, complete the posterior 

 three inches of the external, somewhat convex border of the 

 maxillary part of the cranium ; they articulate by their anterior 

 ends with the malar, and by their internal edges, also convex, 

 with the supratemporal, a small portion of this line of suture 

 being reserved at the back part for connexion with the quad- 

 rates, together with which they form the great posterior external 

 angle of the skull. 



The supratemporals are much larger than the quadrate jugals, 

 and are of an irregular oblong shape ; they are bounded in front 

 by the postorbitals and malars, externally by the malars and 

 quadrate jugals ; and posteriorly they overlap the quadrates. 

 On their inner side they are opposed, first and in front, to the 

 postorbitals, then to the squamous bones, and form, as before 

 said, the greater part of the floor of the temporal fossse, where 

 they overlap considerably the quadrates. 



The quadrate hones form only a narrow slip of the inner side 

 of the floor of the temporal f ossse, and stretch as a rather narrow 

 and irregular border outwards and backwards to join the quad- 

 rate jugals ; these form the extreme external angle of the skull. 



The quadrates enter more largely into the formation of the 

 under surface of the skull, and there, at the external angle, form 

 the condyles for articulation with the mandible, and will be fur- 

 ther described with the rest of the under surface, 



II. Under surface of SJcull (Plate II.) — The dimensions are 

 here the same as those of the upper surface. The whole of the 

 alveolar border of the left maxilla is wanting, except about two 

 inches of the posterior end ; and there are therefore on this side 

 no maxillary teeth remaining. The right maxilla is very nearly 

 perfect. The whole of the middle and posterior part of the 

 palate is much depressed, except along the median line, where, 

 for four inches from the posterior edge of the palate, exists a 

 narrow ridge, formed apparently of the basal part of the presphen- 

 oid and perhaps of the vomer ; from this ridge the palate-bones 

 on each side have been broken oif and pressed down to a lower 



