. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. HIOH SCHOOL Fig. 69.—Pipa Americana. (After Brehm% Structurally tho tadpoles (Fig. 70) differ from the adult chiefly ill the presoi\ce of the tail, the want of limbs and the nature of the respiratory and circulatory organs. T'hey possess adhesive discs near the mouth by which thoy attach themselves to aquatic plants and other objects for suppoi-t. The firat gills are external, but these soon disappear, and give place to internal gills on the four gill-arches; these are concealed by a gill-cover
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. HIOH SCHOOL Fig. 69.—Pipa Americana. (After Brehm% Structurally tho tadpoles (Fig. 70) differ from the adult chiefly ill the presoi\ce of the tail, the want of limbs and the nature of the respiratory and circulatory organs. T'hey possess adhesive discs near the mouth by which thoy attach themselves to aquatic plants and other objects for suppoi-t. The firat gills are external, but these soon disappear, and give place to internal gills on the four gill-arches; these are concealed by a gill-cover, which grows over them in such a way as to leave only a single aperture on tho left side. Underneath this gfll-cover the foue limbs ai'c first budded out and the hind limbs make their ap- pearance immediately afterwards ; both are fully formed before the tail shrivels up. Eventually the gills disapi^ear, and the heart and vessels undei'go such an alteration that the venous blood is sent to the lungs and skin to be aerated and the ai'terial blood to the body generally. 11. 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 Wright, R. Ramsay (Robert Ramsay), 1852-1933. Toronto : Copp, Clark
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
