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Wilder's (1903) description of the skeleton of Necturus is the only one, to date, that is anywhere near complete. Other authors (Mivart, 1869; Ribbing, 1906-07; Howell, 1936; Straus, 1942) have noted portions of the arm-skeleton incidentally to describing various muscles. Chen (1935) described the embryonic development of the pectoral limb. All of these notes generally agree, except in a few details. Francis (1934) described the skeleton of Salamandra. For reasons to appear later, I adopt the terminology of Francis for the skeletal elements of the arm of Necturus.

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