. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 87. Text-fig. 46. Ventral view of interclavicles of mosasaurs. A. Mosasatiriis conodon (after Holland, 1908, fig. 2, X i/s). B. Clidaites propython (after Holland, 1908, fig. 5, X %). C. Plate- carpus (after Capps, 1907, fig. 1, X 77). D. Plotosaurus tuckeri (after Camp, 1942, fig. 9, X 14) with right clavicle. The interclavicle of Clidastes is a thin, flat element that tapers anteriorly to a slightly expanded termination. The posterior end is deeply notched medially and rather heavily longitudinally striated. In Mosasaurus conodon the d

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. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 87. Text-fig. 46. Ventral view of interclavicles of mosasaurs. A. Mosasatiriis conodon (after Holland, 1908, fig. 2, X i/s). B. Clidaites propython (after Holland, 1908, fig. 5, X %). C. Plate- carpus (after Capps, 1907, fig. 1, X 77). D. Plotosaurus tuckeri (after Camp, 1942, fig. 9, X 14) with right clavicle. The interclavicle of Clidastes is a thin, flat element that tapers anteriorly to a slightly expanded termination. The posterior end is deeply notched medially and rather heavily longitudinally striated. In Mosasaurus conodon the dorsal surface of the interclavicle is concave laterally and anteroposteriorly. The thin posterior end is expanded and medially notched. The bone continues anteriorly in a long blade which is interrupted near its anterior termination by a short lateral process from either side. The shaft then constricts and gives off two asymmetrically diverging processes for articulation with the clavicles. In Plotosaurus the interclavicle is oval in cross section and a swelling of the shaft occurs in the region of the lateral processes of M. conodori, but the bone is in other respects very similar to that of M. cojiodon. In Plalecarpxis the interclavicle is a simple flattened rod with a sug- gestion of a swelling near its anterior termination. Williston (in Holland, 1908, p. 163) states that facets for articulation with vestigial clavicles may be present. The interclavicle of PliopJatccarpus is probably similar to that of Platecarpus, but the swelling in the anterior portion of the shaft appears to be more distinct. The bone served as a line of origin for the M. pectoralis. CARTILAGINOUS STRUCTURES IN PECTORAL REGION Marsh (1880, p. 83, pi. 1 fig. 1) described an excellently presened sternum of. 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