Geological magazine . which had however been removed by the succeeded in obtaining a portion of tins material, which on examin-ation proved to contain parts of the skeletons of two specimens ofDendrerpeton Acadianum and one of D. Oweni. No other reptilianbones nor remains of millipedes or of land shells were observed. The specimens of D. Acadianum were the largest yet found, andsome of the bones were in a more perfect state. As examples ofthese I figure (Fig. 1) the two mandibles of the largest seem to have separated on the decay of the body and to havefallen across one
Geological magazine . which had however been removed by the succeeded in obtaining a portion of tins material, which on examin-ation proved to contain parts of the skeletons of two specimens ofDendrerpeton Acadianum and one of D. Oweni. No other reptilianbones nor remains of millipedes or of land shells were observed. The specimens of D. Acadianum were the largest yet found, andsome of the bones were in a more perfect state. As examples ofthese I figure (Fig. 1) the two mandibles of the largest seem to have separated on the decay of the body and to havefallen across one another, so that they lie side by side and are 86 centimetres in length, and one of them shows very wellthe corrugated sculpture of the bone and a number of the the same slab, represented in Fig. 1, is a well-preserved has been exposed by cleaning away some of the stone, whichprobably contains other bones of the fore-leg; but they cannot beworked out without destroying those in 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 <^.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864
