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A nearly complete postcranial skeleton of the Permo-Carboniferous reptile Dimetrodon is described and figured. The structure and possible function of the spines are discussed, and a mechanical explanation for their origin is suggested. The specimen shows Dimetrodon to have been a long-tailed form. The skeleton is restored and a life-restoration given. 2. Models of the probable musculature of the limbs of Dimetrodon are presented.
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Alfred Sherwood Romer (1927) studied this question.
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