. A manual of zoology. Zoology. 442 CHORDATA were grouped with the worms, Init their de\elopment shows them to be more nearlv related to the \ertehrates. The name is due to the tunic or mantleâlacking in the Copehxt:vâ an envelope (tig. 400, /) formed, like a cuticle, Iiy the epithelium of the skin, but distinguished from ordinary cuticula by its structure. It resembles connective tissue in that cells from the mesoderm wander into the ground sulistance, which is sometimes fibrous, sometimes homogeneous, and has an interesting chemical nature. It has the same chemical composition. Ftg. 406.âDia
. A manual of zoology. Zoology. 442 CHORDATA were grouped with the worms, Init their de\elopment shows them to be more nearlv related to the \ertehrates. The name is due to the tunic or mantleâlacking in the Copehxt:vâ an envelope (tig. 400, /) formed, like a cuticle, Iiy the epithelium of the skin, but distinguished from ordinary cuticula by its structure. It resembles connective tissue in that cells from the mesoderm wander into the ground sulistance, which is sometimes fibrous, sometimes homogeneous, and has an interesting chemical nature. It has the same chemical composition. Ftg. 406.âDiagram of a lunicalo ( a. atrium; h. nervous gangiion: c, cndo- stylc; /. iiik-sline; iii, moutli; ii, subneural glaiul; s, slonwcli; /, tunic. ' In tlic centre tlie branchial liasl<et witli the gill slits communicating; «illi the |iei-il)rancliial space, amt this in turn with the atrium. (C,;HinO.) as cellulose and agrees with this substance, so characteristic of plants, in its reactions. No other animals ha\e so much cellulose. The anterior part of the digesti\e tract is modified into a pharynx or liranchial chamber, the walls of which arc perforated with a varvin" number of gill slits, these leading either directly to the exterior or, more usually, into a peribranchial chamber, and from this to a cloaca or alriiim (a), l)efore reaching the outsiile world, ^\â hile the respiratory water passes through the gill slits the food i)articlcs which it contains are 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
