XIV 
ON A FRAGMENT OF A LOWER JAW OF A LARGE 
LABYRINTHODONT FROM CUBBINGTON 
Memoirs of the Geological Survey of the United Kingdom, 18 59, Dp. 506—57. 
THE original specimens of the large Labyrinthodont discovered 
by Dr. Buckland at Guy’s Cliff, and described (from casts) by 
Prof. Owen under the name of Ladbyrinthodon Jaegert, are, it would 
seem, lost ; it is therefore fortunate that one of the collectors of the 
Survey, Mr. Richard Gibbs, has obtained from the quarry at Cubbing- 
ton, whence other Labyrinthodont remains have been obtained, a 
fragment of a mandible which must have equalled, if it did not surpass, 
in size the so-called Labyrinthodon Jaeger. 
This fragment consists of about 74 inches of the hinder part of the 
left ramus of a lower jaw, exhibiting the articular cavity and the 
coronary edge in a good state of preservation, while the lower margin 
is somewhat fractured, and the posterior extremity is broken away. 
The articular cavity is 1} inches long by 2 of an inch wide, concave 
from before backwards, slightly convex from side to side. Its 
posterior margin rises into an abrupt transverse ridge, while its 
anterior limit passes gradually into the coronoid edge. The anterior 
end of the fragment measures 34 inches in depth, and this measure- 
ment must nearly coincide with that of the jaw when perfect. The 
posterior part of the suture between the angular and the articular 
elements of the mandible is well displayed, as is the remarkable, 
strong process sent off inwards and upwards by the former bone. 
The outer surface of the angular bone is deeply ridged and 
grooved, the sculpture appearing to radiate from a point situated near 
the lower margin of the bone and 3} inches in front of the line of the 
posterior edge of the articular cavity. Towards the upper or coronary 
