. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 63 a, b), or of Fro. 63a.— Head and 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. 64).. FIG. 61. — Transveroe section througn the gill of a Teloostean fish, b, branchial leaf- let with capillaries ; c, 1 ranchial artery con- taining venoua blood; d, branchial vein con- taining arterial blood. a. branchial bar. FIG.
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. 63 a, b), or of Fro. 63a.— Head and 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. 64).. FIG. 61. — Transveroe section througn the gill of a Teloostean fish, b, branchial leaf- let with capillaries ; c, 1 ranchial artery con- taining venoua blood; d, branchial vein con- taining arterial blood. a. branchial bar. FIG. G3i.—Transverse section through the body of Eu- nice. Br, gill; C, cirrus ; P, parapodium with a bundle of seta3; D, alimentary caiial; A', nervous system 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 sir-bearing 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; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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Keywords: ., book, bookcentury1800, bookcollectionbiodiversity, bookdecade1890
