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Fig. 25. A, Trinacromerum osborni Williston. Plesiosaur: left mandible to symphysis, inner side, after Williston, 1903; B, Captorhinus agtiti Cope. Cotylosaur: left mandible, from within; C, the same, outer side.
Fig. 26. Limnoscelis paludis. Cotylosaur. Outline of back of skull. Two fifths natural size.
Fig. 27. Cotylosaur. Inner side of mandibles. A, Limnoscelis paludis; B, Labidosaurus hamatus. One half natural size. art, articular; q, quadrate; sur, surangular; cor, coracoid; pa, prearticular; ang, angular; sp, splenial.
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