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THE PECTORAL AND PELVIC GIRDLES
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adult life, but it is free in the crocodiles, and more or less suturally loose in the early pterosaurs, dinosaurs (Fig. 113), phytosaurs (Fig. 111), and rhynchocephalians.
Fig. 110. Pectoral girdle (in part) and front paddles of Elasmosaurus (Plesiosauria). After Riggs. sc, scapula; h, humerus; cor, coracoid; r, radius; u, ulna.
The scapula of the plesiosaurs (Figs. 102, 110) is peculiar in the development of a strong proscapular process projecting downward, forward, and inward, and often meeting its mate in a median symphysis, a character unique among vertebrates. The blade is
