802 H. G. SEELEY ON NEW SPECIES OP 



points ; so that it is distinguished chiefly by its form and measure- 

 ments from the species already described. Prom the anterior border 

 of the pear-shaped foramen parietale to the anterior limit of the pre- 

 maxillaries is fully 1 T 2 ^ inch. Between the orbits the frontal bones 

 measure, where narrowest, T ^ inch. The antero-posterior extent of 

 the orbit is -^ inch. The snout is rather blunt, and the ridges on 

 the cast, which are prolonged from the upper corners of the orbits 

 to the anterior nares, are parallel to each other, and diverge slightly 

 outward as they terminate forward, instead of converging. The 

 nares are rather small ( T \j- inch), and look outward and downward, 

 without any forward tendency. The front of the premaxillary bones 

 is covered by matrix ; but laterally on the right side the bone is 

 separated from the maxillary by a somewhat oblique suture, which 

 descends with a backward inclination from the hinder border of the 

 nostril to the palate, and contains on its lateral aspect three large 

 long teeth with pulp- cavities. In the maxillary bone are seven 

 similar teeth, further apart behind than in front, but never separated 

 by interspaces so wide as the teeth. The length of jaw occupied by 

 the ten teeth and their interspaces is -j^ inch. The bases of the 

 fangs are invested by bone, so as to have the aspect of being in 

 sockets. In the corresponding part of the lower jaw, extending for 

 ■fa inch, are six cylindrical teeth, which decrease in length back- 

 ward ; the front ones are fully -^ inch long. The teeth are smooth, 

 without a trace of striations. The maxillary bone is convex from 

 above downward ; it is pierced by a large oval foramen, which is 

 above and behind the second maxillary tooth. Above the maxillary 

 bone, and extending under it so as to form the anterior corner of 

 the orbit, is the large lachrymal or prefrontal bone, which covered 

 the preorbital inflation and joined the nasal bone. The width of 

 the skull at the outward bend of the malar bone, which is much 

 sharper than in other species, is about ly 8 ^ inch. The height of 

 the skull, including the lower jaw, is 1-j^- inch. The lower jaw is 

 strong and deep, and increases in depth from before backward ; it 

 is flattened, compressed from side to side, and straight ; but beneath 

 the quadrate bone it becomes wider than deep, and is subquadrate 

 in section where it is fractured through ; it extends for a short dis- 

 tance behind the quadrate bone, and is rounded and compressed 

 from above downward. The dentary bone is large, and on its inner 

 side the splenial bone extends to the anterior extremity. The qua- 

 drate bone is vertical, overlapped in front by the quadrato-jugal, 

 which curves round, much as in chelonians, so as to cover its lateral 

 aspect, except at the articulation. Above and in. front of the 

 quadrato-jugal is the malar, which forms the lower and hinder 

 border of the orbit. Both these bones extend upward almost to the 

 roof of the skull to meet a squamous bone, apparently the squamosal, 

 which overlaps the parietal, reaches forward to the hinder margin 

 of the orbit, becomes massive behind, and extends over the strong 

 transverse element at the back of the skull, which can only be one 

 of the otic bones, probably that called paroccipital by Professor 

 Owen. The upper part of the quadrate bone is wedged into a ver- 



