1837.] Notice of a fossil Batrachian. 541 



3. The anterior frontals ; their suture is entirely effaced, a case 

 not uncommon in aged specimens of recent reptiles. 



4. The intermaxillary bone ; the muzzle having suffered a great 

 deal, it is impossible to discover the junction between this and the 

 anterior frontals. — Between the arch and the corresponding part of the 

 maxillary there is a longitudinal space, filled with matrix, so that the 

 intermaxillary appears superincumbent over the upper jaw, while it, 

 in the recent frogs, forms the anterior part of the jaw, and is as well 

 as the latter furnished with teeth. 



5. The apophyses of the intermaxillary, proportionally long and 

 slender, support the arches, a distribution observed in the axolote as 

 represented by Cuvier, (loc. cit. pi. XXVII. figs. 24 and 25.) 



6. The apophysis which terminated the anterior part of the cavity 

 of the eye, analogous to the apophysis, which in recent frogs proceeds 

 from the side of the anterior frontals. — In front of this and nearer 

 towards the muzzle we are to search for the situation of the nostrils. 



7. Matrix with projecting indistinct fragmina of bones. 



8. Part of the lower jaw. 



B. A front view 

 of the fossil shewing the compression, the position of the teeth, and 

 the angle of the lower jaws, pressed up into the cavity of the palate : 

 the references as in fig. A. 



C. The lower surface. 



1. The intermaxillary bone. 



2. The upper jaw : in this and the surrounding matrix a number 

 of teeth, the largest of which in the middle toward the symphisis. 



3. The lower jaw formed by two wide arches separated at the 

 symphisis, the external surface convex, the internal excavated. 



4. Fragments probably of the pterygoid bone. (Vide Cuvier, loc. 

 cit. p. 389.) 



D. Teeth, (nat. size.) 



The teeth are comparatively small, conic and recurved, of the same 

 formation as those of the serpents, ( 3 shews a lateral section of a tooth.) 



The larger are fixed close to each other and in a single row, while 

 two or three rows of small teeth appear in the left lateral branch of 

 the upper jaw. The matrix covering the left side of the palate con- 

 tains several fragmina, the original situation of which, whether in 

 the palate or in either of the jaws, it would be, as before said, difficult 

 to determine. 



4 A 



