. The common frog. Frogs. VI.] THE COMMON FROG. 85 joints than three, while, in some lizards, the fourth digit may have as many as five Fig. 50.—Dorsal surface of skeleton of right hand of the Tortoise, CheJydra (after Gegenbaur). c, cuneiforine : hi, intermedium (or centrale) ; /, lunare ; in^—w5, metacarpals ; r, 'radius; s, scaphoides ; it, ulna ; i—5, the five distal carpals, namely—I, trapezium ; 2, trapezoides ; 3, magnum ; 4 and 5, divided unciforme. In the frog the wrist-bones (called respectively the magnum and unciforme) which support the third, fourth, and the little finger
. The common frog. Frogs. VI.] THE COMMON FROG. 85 joints than three, while, in some lizards, the fourth digit may have as many as five Fig. 50.—Dorsal surface of skeleton of right hand of the Tortoise, CheJydra (after Gegenbaur). c, cuneiforine : hi, intermedium (or centrale) ; /, lunare ; in^—w5, metacarpals ; r, 'radius; s, scaphoides ; it, ulna ; i—5, the five distal carpals, namely—I, trapezium ; 2, trapezoides ; 3, magnum ; 4 and 5, divided unciforme. In the frog the wrist-bones (called respectively the magnum and unciforme) which support the third, fourth, and the little fingers, are formed together into a single ossicle. The same condition, however, some- times occurs even in the orang. On the other hand, the single bone which in man and beasts supports both the " ring " and the " little " fingers, may be re- presented by two ossicles in the frog's class (as in Salaina7idra) and in some reptiles (as in CJielydrd). No member of the frog's class which has an arm at all, bears less than two fingers (as in Proteus) upon it. Thus we meet with a number as small as that which is developed amongst beasts in ruminants, but not so small a number as in the horse. In the rudimentary condition of its thumb the frog participates in a very common defect, since this member is absent in very many forms. It is so even in creatures as highly organised and as like man in bodily structure as monkeys, since both the spider-. 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 Mivart, St. George Jackson, 1827-1900. London, Macmillan and co.
Size: 1300px × 1921px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1881
