. Bulletin. Natural history. 86 PEABODY MUSEUM BULLETIN 23. Text-fig. 45. Scapula-coracoid of Tylosaurus (after Williston, 1898b, pi, 46, x 1/3). coracoid of Plotosaurus tuckeri is entire. In the two Niobrara species of Plate- carpus the coracoid varies from deeply emarginate to lacking an emargination altogether. The coracoid of Plioplatecarpus (Dollo, 1882, pi. 6 fig. 1) is widely emarginate, that of Ectenosaurns (FHM 7937) is slightly notched, and that of Prognathodon overtoni is deeply emarginate (Williston, 1897a, p. 97). It is usually entire in Tylosaurus, but may be slightly notched. In
. Bulletin. Natural history. 86 PEABODY MUSEUM BULLETIN 23. Text-fig. 45. Scapula-coracoid of Tylosaurus (after Williston, 1898b, pi, 46, x 1/3). coracoid of Plotosaurus tuckeri is entire. In the two Niobrara species of Plate- carpus the coracoid varies from deeply emarginate to lacking an emargination altogether. The coracoid of Plioplatecarpus (Dollo, 1882, pi. 6 fig. 1) is widely emarginate, that of Ectenosaurns (FHM 7937) is slightly notched, and that of Prognathodon overtoni is deeply emarginate (Williston, 1897a, p. 97). It is usually entire in Tylosaurus, but may be slightly notched. In any case the M. supracoracoideus must have been powerfully developed in mosasaurs. The M. subcoracoscapularis arises over nearly the entire medial surface of the scapulo- coracoid in Varanus, although the M. sternocoracoideus does insert on the ante- rior rim of the epicoracoid. There is little reason to think these muscles were differently arranged in mosasaurs. CLAVICLE The clavicle is known only in Plotosaurus but articulations on the inter- clavicle show that it was present in several other forms as well. In Plotosaurus the bone is reminiscent of a jugal but is less sharply recurved. The M. deltoides clavicularis probably took its origin from the posteroventral surface. INTERCLAVICLE An interclavicle has been described in C. propython (Holland, 1908, fig. 5), M. conodon (ibid., figs. 1-4; Martin, 1953), Plotosaurus bcnnisoni (Camp, 1942, fig. 3), Plotosaurus tuckeri (ibid., fig. 9), Platecarpus (Williston, 1899; Capps, 1907, fig. I) and in Plioplatecarpus (Dollo, 1885b, fig. 1).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. New Haven, Peabody Museum of Natural History, Yale University
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