Animal locomotion, or Walking, swimming, and flying, with a dissertation on aëronautics (1874)
Pettigrew, James Bell, 1834-1908 · New York : D. Appleton & company · leaf 98
ventrals (the homologuesof the posterior extremities) can be divaricated and approximated, and theintervening webs .spread out or folded up.—Op. cit. vol. i p. 252. PROGRESSION ON AND IN THE WATEK. 73 in the pipefish, Avhose motions are unwontedly sluggish.The twisting of the tail is occasionally… … FIG. 33.—The Porpoise (Phocmna cornmunis). Here the tail is principally en-gaged in swimming, the anterior extremities being rudimentary, ami resem-bling the pectoral fins of lishes. Compare with iig. 30, p. 05. — Original.
Animal locomotion · Aeronautics
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