NEW LABYRINTHODONT AMPHIBIAN. 311 



the snout to the occipital margin i\ths of an inch, in width at 

 the broadest part i-o-ths of an inch ; the horns are -i-oths of an 

 inch in length. 



Two or three teeth are distinguishable in one of the mandibles, 

 but are somewhat injured ; they are small, have the sides nearly 

 parallel, and are slightly curved ; the apices are apparently ab- 

 ruptly pointed. The sternal plates are distinctly displayed, but 

 are in a much disturbed condition ; all the three, however, can 

 be made out, two of them being much mutilated. They lie 

 immediately behind the head, at the left side of the specimen, 

 towards the ventral aspect ; two are a little in advance of the 

 third. They all have the surface covered with a minute reticu- 

 lation of raised lines, which assume a radial disposition, as if 

 from centres of growth. Behind the plates, on the left or ven- 

 tral side of the body, there is a sort of roll, as it were, extending 

 someway backwards, which seems to be composed of minute 

 elliptical scales ; they are, however, very indefinite ; their exact 

 form could not be determined. 



The vertebrse, of which there are twenty-three or twenty-four, 

 are very apparent, but their precise form is rather difficult to 

 make out ; they are nevertheless in regular order, but are some- 

 what obscured by the matrix. They each bear a long compressed 

 or flattened plate-like dorsal spine, which is as high or a little 

 higher than the centrum ; its dorsal or free margin is truncated 

 and serrated ; below it is contracted in the antero-posterior di- 

 rection, and, expanding above, somewhat resembles a fan, the 

 resemblance being heightened by the strong radiating strise that 

 cover the sides. They are very similar to the vertical processes 

 of TJrocordylus Wandesfordii, but more particularly agree, in 

 proportion and character, with the subvertebral bone or spine. 

 The three or four terminal posterior vertebrte have in addition 

 subvertebral bones similar in form and size to the dorsal spines. 

 From this fact it would appear that these three or four vertebras 

 belong to the tail ; and if the new species is as rich in caudal 

 vertebrte as U. Wandefordii, our specimen must have lost at least 

 seventy of the bones of its tail. U. reticulatns has therefore 

 about twenty trunk or precaudal vertebrae, the number that is 



