2 Dr. A. .S, \V..(Hl\varil on Two Skulls 



shown to occupy ini>n> than lialf the total lengtli of the skull , 

 and their anterior hali' is niucli attenuateil. Thev seein to b<'. 

 fused tojjjcther in the median line, and their stout palatal 

 plates are slightly divergent behind where they form the 

 anterior border of the fossa into which the posterior nares 

 open. The jagged suture between the premaxilla and maxilla 

 {nix.) is distinct on each side of the fossil, while the palatal 

 plate of the maxilla, doubtless followed behind by the palatine 

 bone, lies in the same plane as the premaxillary roof of the 

 mouth, and forms the lateral boundary of the posterior narial 

 fos.^a. Crushing on tiie right and imperfection on the left 

 side obscure the form of the palatine (pn.) ; but it is quite a 

 small element and seems to be a little thickened at the 

 rounded angle, where it abuts upon the pterygoid. Behind 

 the palatine there is a small infraorbital vacuity {iov.)j which 

 is longer than broad. The pterygoids {j>l.) are very slender 

 bones, separated for the greater part of their length by a large 

 interpterygoid vacuity (tpv.). For a considerable extent they 

 are shown only in impression in the fossil. The hinder limit 

 of the j)terygoid element is not clear on either side, but it 

 evidently expands into a thin vertical lamina overlapping the 

 quadrate (qu.). In front of this it becomes a slender bar, 

 expanding slightly outwards at its middle, where the infra- 

 orbital vacuity is separated by a small rod of bone from the 

 rather larger inlratemporal vacuity {itv.). This very small 

 rod {a;) is probably a transverse bone connecting the pterygoid 

 with the hinder end of the maxilla. In fiont of this point 

 the two pterygoids begin to converge forwards, first touching 

 the palatines, and eventually meeting in the middle line 

 as they bend upwards to the roof of the posterior narial 

 fossa. 'Ihey doubtless meet the vomers in front, but it seems 

 impossible to remove enough matrix to expose the latter 

 elements. At the back of the skull the small basicranial 

 axis is scarcely seen ; but a pair of long and slender basi- 

 ptcrygoid processes (bpt.) connect it with the pterygoids. 

 The elongated quadrate (qu.) is inclined sharply forwards as 

 usual, but its articulation for the mandible is broken away. 

 The post-temporal vacuity (/»/y.) between the quadrate and 

 the quadratrjugal is conspicuous, Tee»h are confined to the 

 margin of tiie jaw, where they are arranged in regular pairs. 

 They are long, slender, sujooth, and somewhat laterally com- 

 pressed, with a minute pul[)-cavity towards the base. 'I'hey 

 are veiy obliquely inserted in well-separated sockets, eight 

 contained in each premaxilla, two in each maxilla. 



The mandible (tig. 2) is remarkable for the slenderness of 

 its anterior toothless beak, which is longer than that of the 



