. The common frog. Frogs. 16 THE COMMON FROG. [chp. br^ and br"^). These openings are termed ''visceral clefts," which lead from the exterior into the throat, as already described. The solid pillars (or intervals) between the clefts, i.e., the " visceral arches," become furnished with gills,i or braiicJiicE, and are therefore 41 rm. Fig. 2.—View of left side of Embryo Tadpole (after Parker), br^ and br^, first and second external branchiae ; cl'^—cl^, the six visceral clefts ; cp the left " holder " ; d, the olfactory organ ; e, the eye : //, the left lip ; m, th

- Image ID: REF1DB
. The common frog. Frogs. 16 THE COMMON FROG. [chp. br^ and br"^). These openings are termed ''visceral clefts," which lead from the exterior into the throat, as already described. The solid pillars (or intervals) between the clefts, i.e., the " visceral arches," become furnished with gills,i or braiicJiicE, and are therefore 41 rm. Fig. 2.—View of left side of Embryo Tadpole (after Parker), br^ and br^, first and second external branchiae ; cl'^—cl^, the six visceral clefts ; cp the left " holder " ; d, the olfactory organ ; e, the eye : //, the left lip ; m, th
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Image ID: REF1DB
. The common frog. Frogs. 16 THE COMMON FROG. [ch\p. br^ and br"^). These openings are termed ''visceral clefts," which lead from the exterior into the throat, as already described. The solid pillars (or intervals) between the clefts, i.e., the " visceral arches," become furnished with gills,i or braiicJiicE, and are therefore 41 rm. Fig. 2.—View of left side of Embryo Tadpole (after Parker), br^ and br^, first and second external branchiae ; cl'^—cl^, the six visceral clefts ; cp the left " holder " ; d, the olfactory organ ; e, the eye : //, the left lip ; m, the aperture of the mouth ; op, the hinder margin of the rudimentary operculum. called ".branchial arches." The eggs are hatched towards the end of April, and the tadpole emerges in the stage represented at Fig. 3, 1. It has a rela- tively large head, a rounded body, and a long tail, by lateral undulations of which the little creature swims about. From behind the head, on each side, jut forth external branchiae as a small plume-like structure, but no limbs are visible. As the tadpole grows, the external plumose gills at first greatly enlarge (Fig. 3, 2 and 2«), but after- wards become gradually absorbed, and are succeeded by short gill filaments, which are developed along each of the branchial arches. These latter filaments ^ Gills (or branchiae) are delicate processes of skin richly supplied mth minute blood-vessels, wherein the blood becomes exposed to the purifying action of the air dissolved in the water.. 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 work.. Mivart, St. George Jackson, 1827-1900. London, Macmillan and co.

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