. A text-book of agricultural zoology. Zoology, Economic. 326 ICHTHYOPSIDA rounded by gelatinous discs, the black ovum (fig. 167, 1) being seen as a small round body in the middle. The young (3) when hatched and free from the gelatinous envelope attach themselves by two suckers to the jeUy of the spawn. The young Tadpoles are very like " tailed amphibia," and in their earliest stage have. Pio. 167.—Development of the Pbog. 1 and 2, Ova; 3-5, tadpoles; 6, period when i5rst pair of legs form (posterior pair); 7, both pairs of legs present (Urodela stage); 8, tail disappearing; 9, adult
. A text-book of agricultural zoology. Zoology, Economic. 326 ICHTHYOPSIDA rounded by gelatinous discs, the black ovum (fig. 167, 1) being seen as a small round body in the middle. The young (3) when hatched and free from the gelatinous envelope attach themselves by two suckers to the jeUy of the spawn. The young Tadpoles are very like " tailed amphibia," and in their earliest stage have. Pio. 167.—Development of the Pbog. 1 and 2, Ova; 3-5, tadpoles; 6, period when i5rst pair of legs form (posterior pair); 7, both pairs of legs present (Urodela stage); 8, tail disappearing; 9, adult frog. (Nicholson.) both internal and external gills (4). The tail is long, thin, and fish-like, but there are no fin-rays. The external gills soon dis- appear. The upper and lower jaws become hardened, and form a kind of beak. By degrees small bud-like outgrowths appear between the body and tail, which grow out into the hind-limbs (6), which are always the first to appear in the Frogs and Toads,. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
