. A manual of zoology. Zoology. Fig. 253.—Anterior end of Nais elinquls. h, cerebrum, connected by commissure wdth ventral chain, n\ dg, dorsal, vg, ventral blood-vessel; m, muscular layer of skin; df, vf, dorsal and ventral cha^tts; d, septa; k, prostomium; 0, mouth. among the somites, and hence they differ but slightly among themselves. The prostomium always bears tactile organs and frequently eyes, which in many marine forms are highly developed, with lens, vitreous body, od, im. rm vv bm Fig. 254.—Schematic cross-section of an annelid (after Lang), ac, aciculum; b, chstse; bm, ventral nerv
. A manual of zoology. Zoology. Fig. 253.—Anterior end of Nais elinquls. h, cerebrum, connected by commissure wdth ventral chain, n\ dg, dorsal, vg, ventral blood-vessel; m, muscular layer of skin; df, vf, dorsal and ventral cha^tts; d, septa; k, prostomium; 0, mouth. among the somites, and hence they differ but slightly among themselves. The prostomium always bears tactile organs and frequently eyes, which in many marine forms are highly developed, with lens, vitreous body, od, im. rm vv bm Fig. 254.—Schematic cross-section of an annelid (after Lang), ac, aciculum; b, chstse; bm, ventral nerve cord; dc, dorsal cirrus; dp, notopodium; k, gill; Im, longi- tudinal muscles; md, digestive tract; np, nephridium; oi', ovary; rm, circular muscles; tin, transverse muscles; Ir, nephrostome; vc, ventral cirrus; vd, vv, dorsal and ventral blood-vessels; vp, neuropodium. and retina (fig. 84,1, II). Statocysts are rare, but occur in diverse groups. Ciliated pits (olfactory ?) occur on the head, goblet organs (taste) on head and trunk, and lastly, lateral organs, sensory structures of unknown function, may be metamerically 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
