NEW LABYEINTHODONT AMPHIBIAN. 225 



(c, b, d). The coronal portion is on the slab on which the right 

 side of the trunk rests ; the lower or basal portion and muzzle 

 are on the other, which may be denominated the left slab, as it 

 contains the left side of the trunk. 



The cavity of the cranium was filled with crystallized carbo- 

 nate of lime, and the bone is in a very flaky tender condition, 

 having a chalky or burnt appearance, and in some places it is 

 so much reduced as to be difficult to trace ; neither the sutures 

 of the component bones nor much of the surface character can 

 be determined. 



The entire length of the skull is nine inches and three-quar- 

 ters ; but the extremity of the muzzle is wanting. The occipital 

 region is much injured ; it is wide, truncated, and angulated at 

 the sides ; it measures across five inches and a quarter : for 

 about an inch forward the skull widens a little, and then sud- 

 denly tapers for nearly an inch and three-quarters, at which 

 point it is three inches wide ; here the muzzle seems to com- 

 mence, and from hence it tapers gradually to the broken ante- 

 rior extremity, where it is a little more than an inch and a half 

 wide. 



The portion that remains of the narrow elongated muzzle is 

 in a better state of preservation than the rest of the skull, and 

 is seven inches long, and measures across the centre two inches 

 and a half. . Only a part of the upper surface was exposed ; but, 

 aided by the skilful manipulation of our friend Mr. Atthey, to 

 whom our best thanks are due, we have been enabled to work 

 out the features of this characteristic portion of the cranium. 

 The matrix has been carefully removed by that gentleman from 

 the sides, and has been dug away from beneath, so as to exhibit 

 to some extent the palate. Thus revealed, the muzzle is seen 

 to be much depressed, slightly convex above, with the roof of 

 the mouth apparently flat, or only a little concave. The maxillae, 

 which seem to form the sides of the muzzle, are thick at the 

 outer margins, but are quite thin above. Unfortunately, how- 

 ever, the roof of this portion is much injured ; there is, never- 

 theless, a strip about half an inch wide, extending the whole 

 length of the maxilla along the right side, and a small portion 



p 



