. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. Fig. 63a,—Head ami anterior body segments of a Eunice, viewed from the dorsal sur- f-ace. T, tentacles. Ct, tentacular cirrus. C, parapodial cirrus. Br, parapodial gill. lancet-shaped closely-packed leaves with a large surface extension (fig. Fig. 61. — Transverse section througn the gill of a Teleostean fish, i, branchial leaf- let with capillaries ; c, branchial artery con- taining venous blood; d, brancliial vein con- taining arterial blood. <2, branchial bar. Fig. 63J.—Transverse sectio
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. Fig. 63a,—Head ami anterior body segments of a Eunice, viewed from the dorsal sur- f-ace. T, tentacles. Ct, tentacular cirrus. C, parapodial cirrus. Br, parapodial gill. lancet-shaped closely-packed leaves with a large surface extension (fig. Fig. 61. — Transverse section througn the gill of a Teleostean fish, i, branchial leaf- let with capillaries ; c, branchial artery con- taining venous blood; d, brancliial vein con- taining arterial blood. <2, branchial bar. Fig. 63J.—Transverse section through the body of Eu- nice. Br, gill; C, cirrus ; P, parapodium with a bundle of setaj; D, alimentary canal; iV, nervous cystcm The organs of aerial respiration, on the contrary, are internal. They present likewise the condi- tion favourable for an exchange of gases between the air and the blood, viz., a large extent of surface. They have the form either of lungs or cir-b£Viring tubes. In the first case (Spiders, Vertebrates) they consist of spacious sacs with alveolar or spongy. 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 Claus, Carl, 1835-1899; Metcalf Collection (North Carolina State University). NCRS. London, Swan Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
