148 8ir J. W. Datvson — On Dendrerpeton Acadianum, etc. 



the mandible, thus exceeding in relative size the humerus of the 

 American Alligator, while its form indicates a limb of much muscular 

 power. Other specimens show that the hind-limb was not larger 

 than the fore-limb ; on the whole it was perhaps feebler, so that in 

 this animal there was no approach to that exaggerated size of the 

 hind-limb seen in some of the larger Labyrinthodonts. 



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Fig. 2. — Ribs, Phalanx, Scales, Scapular bones, and part of Skull of Dendrerpeton 

 Acadianum. Natural size. 



The slab represented in Fig. 2 shows the anterior part of the 

 crushed skull, giving its broadly rounded form in front, and the 

 sculpturing of the bone. After the photograph from which the cut 

 is copied was taken, a portion of the matrix was removed, so as to 

 expose the outer teeth on one side and one of the large inner teeth. 

 One of the former with the sculpturing of the edge of the maxillary 

 bone is represented enlarged in Fig. 3. 



Fig. 3. — Outer toofcli and portion of Maxillary bone of Dendrerpeton 

 Acadianum. — Enlarged. 



On the slab Fig. 2 are two slender bones and a larger bone which 

 I suppose to be parts of the shoulder-girdle. There are also two of 

 the anterior ribs and some bones of the foot (among them a phalanx) 



