Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . are elongated in a disproportionate manner, and the skin isstretched across them, so as to serve the purpose of a wing. 150 ORGANS OP LOCOMOTION In birds, the pigeon, for example (fig. 164), there are but twofingers (</), which are soldered, and destitute of nails ; andthe thumb is rudimentary. § 28-4. The arm of the turtle (fig. 166) is peculiar in having, Fig. 165 Fig. 166.

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870