. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 93. Text-fig. 5L Forelimb of Mosasaurus conodon (after Martin, 1953, x l^)- peculiar because both the olecranon process and posterodistal portion of the bone are reduced, giving it a bowed appearance. The antebrachial foramen is circular and very small. In Tylosaurus and Clidastes sternbergi the long slender ulna is hardly expanded distally, although the olecranon process is well de- veloped. The antebrachial foramen in both forms is lenticular. CARPUS The carpal elements are very similar in Clidastes liodontus, C. propython, Mosasaurus
. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 93. Text-fig. 5L Forelimb of Mosasaurus conodon (after Martin, 1953, x l^)- peculiar because both the olecranon process and posterodistal portion of the bone are reduced, giving it a bowed appearance. The antebrachial foramen is circular and very small. In Tylosaurus and Clidastes sternbergi the long slender ulna is hardly expanded distally, although the olecranon process is well de- veloped. The antebrachial foramen in both forms is lenticular. CARPUS The carpal elements are very similar in Clidastes liodontus, C. propython, Mosasaurus conodon and M. inissouriensis, and their general shape may be easily seen from the figures. The radiale is especially wide and a well-ossified inter- medium and ulnare, as well as a second, third and fourth distal carpal, are present. In both genera the intermedium enters broadly into the antebrachial foramen and in Clidastes the radiale may also border on it. The carpal elements are quite heavy where they meet the radius-ulna, but decrease to half this thick- ness at their metacarpal articulations. A thin, kidney-shaped pisiform contacts. 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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