Geological magazine . Fig. 1.—Humerus and Mandibles of Dendrerpeton Acadianum. j^Tatural size. I would call attention to the humerus as indicating the develop-ment of the fore-limb in this species. The bone in this probablymature specimen is better ossified than in smaller and probablyyounger specimens. In length it is 4-3 centimetres, or half that of 148 8ir J. W. Datvson—On Dendrerpeton Acadianum, etc. the mandible, thus exceeding in relative size the humerus of theAmerican Alligator, while its form indicates a limb of much muscularpower. Other specimens show that the hind-limb was not large
Geological magazine . Fig. 1.—Humerus and Mandibles of Dendrerpeton Acadianum. j^Tatural size. I would call attention to the humerus as indicating the develop-ment of the fore-limb in this species. The bone in this probablymature specimen is better ossified than in smaller and probablyyounger specimens. In length it is 4-3 centimetres, or half that of 148 8ir J. W. Datvson—On Dendrerpeton Acadianum, etc. the mandible, thus exceeding in relative size the humerus of theAmerican Alligator, while its form indicates a limb of much muscularpower. Other specimens show that the hind-limb was not largerthan the fore-limb; on the whole it was perhaps feebler, so that inthis animal there was no approach to that exaggerated size of thehind-limb seen in some of the larger Labyrinthodonts. V, C X /f <^.. Fig. 2.—Ribs, Phalanx, Scales, Scapular bones, and part of Skull of DendrerpetonAcadianum. Natural size. The slab represented in Fig. 2 shows the anterior part of thecrushed skull, giving its broadly rounded form in front, and thesculpturing of the bone. After the photograph from which the cutis copied was taken, a portion of the matrix was removed, so as toexpose the outer teeth on one side and one of the large inner of the former with the sculpturing of the edge of the maxillarybone is represented enlarged in Fig. 3.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864
