. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. CHARACTERS OF AVES. 461 pansion of the wing; the hand is thus fixed in a state of pro- nation; all power of flexion, extension, or of rotation, is removed from the wrist-joint,, so that the wing strikes firmly, and with the full force of the contraction of the depressor muscles, upon the resisting air" (Owen). One other bone. t'ig. 181.—Fore-limb of the Jer-falcon. h Humerus : r Radius ; « Ulna : / " Thumb :" m Metacarpals, anchylosed at their extremities ; p p Pha
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. CHARACTERS OF AVES. 461 pansion of the wing; the hand is thus fixed in a state of pro- nation; all power of flexion, extension, or of rotation, is removed from the wrist-joint,, so that the wing strikes firmly, and with the full force of the contraction of the depressor muscles, upon the resisting air" (Owen). One other bone. t'ig. 181.—Fore-limb of the Jer-falcon. h Humerus : r Radius ; « Ulna : / " Thumb :" m Metacarpals, anchylosed at their extremities ; p p Phalanges of fingets. of the normal carpus (namely, the " os magnum ") is present, but this is anchylosed with one of the metacarpals. There are thus really three carpal bones, though only two appear to be present. The carpus is followed by the metacarpus, the condition of which agrees with that of the carpal bones. The two outermost of the normal five metacarpals are absent, and the remaining three are anchylosed—together with the OS magnum—so as to form a single bone (fig. 181, m). This bone, however, appears externally as if formed of two meta- carpals united to one another at their extremities, but free in their. median portion. The metacarpal bone which cor- responds to the radius is always the larger of the two (as being really coipposed of two metacarpals), and it carries the digit which has the greatest number of phalanges. This digit corresponds with the " index" finger, and it is com-. 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 Nicholson, Henry Alleyne, 1844-1899. New York : D. Appleton
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