. A manual of zoology. Zoology. je- m PiQ^ 6jj^—Pore feet of ungulates (after Flower). A-C, ; D-F, artiodactyle. A, tapir; B, rhinoceros; C, horse; /), pig; E, deer; F, camel, c, trique- trum ("ulnare); I, lunatum (intermedium); m, capilatum; m^-m^, rudiments of meta- carpals II and V; p, pisiforme; R, radius; s, scaphoid (radiale); td, trapezoid; tm, trapezium; U, ulna; u, hamalum; II-V, digits. pressed differently in the odd-toed {perissodacfylc) and even-toed (artiodaclyle) forms. In the Perissodactyla the axis of pressure passes through the middle toe (fig. 615, A-C, II
. A manual of zoology. Zoology. je- m PiQ^ 6jj^—Pore feet of ungulates (after Flower). A-C, ; D-F, artiodactyle. A, tapir; B, rhinoceros; C, horse; /), pig; E, deer; F, camel, c, trique- trum ("ulnare); I, lunatum (intermedium); m, capilatum; m^-m^, rudiments of meta- carpals II and V; p, pisiforme; R, radius; s, scaphoid (radiale); td, trapezoid; tm, trapezium; U, ulna; u, hamalum; II-V, digits. pressed differently in the odd-toed {perissodacfylc) and even-toed (artiodaclyle) forms. In the Perissodactyla the axis of pressure passes through the middle toe (fig. 615, A-C, III), while the other toes disappear symmetrically around this. Since the first toe is early lost, toe V is next to disappear {B), and then toes II and IV (C), so that at last there remain only the skeleton of the middle toe (horse), the rudiments of toes II and IV persisting as the small splint hones. In the Artiodactyla the axis of pressure falls between toes III and IV (£>), which support the body, are equally developed and frequently fuse, at least so far as the metacarpals are concerned [E, F). The figures D-F show how the other digits disappear, digit I being lost still earlier. Since the weight of the body rests more upon the hind legs than upon the front ones, the former are the first to become modified. Since we are able, with the fossils, to follow in detail the lines of descent of both artiodactyles and perissodactyles, it is certain that these form diverging series, distinct from the beginning. In each series. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
