. AMERICAN JURASSIC PLESIOSAURS 347 
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Fic. 1.—1a, left pectoral paddle of Muraenosaurus reedit, <i. 16, M. leedsi 
Seeley, pectoral paddle, Xz. 1c, pectoral paddle of Pantosaurus striatus Marsh (after 
a photograph by Williston), much reduced. 
