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Fig. 16. A, Dimetrodon incisivus Cope. Pelycosaur: left mandible, outer side. B, Dimetrodon incisivus Cope. Pelycosaur: left mandible, inner side. C, Dimetrodon incisivus Cope. Pelycosaur: right mandible, inner side. D, Labidosaurus hamatus Cope. Cotylosaur: right mandible, inner side. E, Labidosaurus hamatus Cope. Cotylosaur: right mandible, outer side.
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