Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 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. 64j. 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
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 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. 64j. 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
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