. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Skeleton 62- Various attempts have been made to homologize the skeletons of the paired fins with the bones in the lateral appendages of tetrapods, but with- out universal satisfaction to comparative anatomists. Beginning with the amphibians each lateral anterior appendage consists of the following sequence of bones, joined together as a system of levers: a single long bone, the humerus, articulat- ing with the girdle; a pair of long bones, the radius a
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Skeleton 62- Various attempts have been made to homologize the skeletons of the paired fins with the bones in the lateral appendages of tetrapods, but with- out universal satisfaction to comparative anatomists. Beginning with the amphibians each lateral anterior appendage consists of the following sequence of bones, joined together as a system of levers: a single long bone, the humerus, articulat- ing with the girdle; a pair of long bones, the radius and ulna; primarily three rows of wrist bones, ossa carpi; five palm bones, metacarpalia; and finally a set of digit bones, or phalanges, for each of the five fingers. The typical land appendage is therefore pen- tadactyl (penta, five; dactyl, digit). In primitive plan there are three wrist bones, or carpals, in the first row, two in the second, and five in the third (Figs. 529 and 558) while the five digits, beginning with the thumb, consist of two, three, four, five, and three phalanges respectively. (See Table X.). Fig. 557. Diagram of a pectoral fin, "archipterygium," of Neocera- todus. (After Galloway.). 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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