. Animal physiology. Physiology, Comparative; Physiology, Comparative. 96 ANNELIDA, OR LEECH AND WORM TRIBE. which are placed along each side, and which open directly out- wards, so as to receive either air or water. It is remarkable that, in these and some other Annelida, the blood should have a. Fig. 57.—Nereis. reddish or port-wine colour, instead of being pale or white, as in the Articulata in general (§. 226) ; but this colour is not the consequence of any real resemblance between the blood of these Annelida, and that of Yertebrata; as will be explained hereafter (§. 226). Most of the inf
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 96 ANNELIDA, OR LEECH AND WORM TRIBE. which are placed along each side, and which open directly out- wards, so as to receive either air or water. It is remarkable that, in these and some other Annelida, the blood should have a. Fig. 57.—Nereis. reddish or port-wine colour, instead of being pale or white, as in the Articulata in general (§. 226) ; but this colour is not the consequence of any real resemblance between the blood of these Annelida, and that of Yertebrata; as will be explained hereafter (§. 226). Most of the inferior tribes of this class are purely aquatic ; and they breathe by gills, which form tufts that are disposed on various parts of the body. In the Nereis, or Sea-centipede, (Fig. 57), these tufts are arranged regu- larly on the several segments; and the animal can swim by the motion that it gives them ; besides which it has a kind of bristle-shaped appendage, that seems like an undeveloped leg, which assists it in crawling. But there are others of these marine-worms, that form a tubular shell, in which they reside during the greatest part of their lives ; and in these the gills, if disposed along the body,would have been removed from the access of water ; they are therefore arranged round the head, often form- ing (as in the Serpulce, Fig. 58) tufts of great brilliancy and elegance. 116. From the Annelida we pass to animals which still re-. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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