. A manual of zoology. Zoology. Fig. 266. Fig. 267. Fig. 266.—Anatomy of Phascolosoma gouldi (orig.). a, anus; a, anterior retractors; d, digestive tract; g, gonads; ni, mouth; «, nephridia; nc, ventral nerve cord; pr, posterior retractors. Fig. 267.—Larva (trochophore) of Echiurus (after Hatschek). a, anus; d, intestine; hw, postoral cilia; kn, protonephridia; m, mouth; mes, mesoderm bands with indication of segments; 11, ventral nerve cord; sc, cesophageal commissure; sp, apical plate; vw, preoral ciliated band. tropics. Most species burrow through the earth, swallowing the humus and casting
. A manual of zoology. Zoology. Fig. 266. Fig. 267. Fig. 266.—Anatomy of Phascolosoma gouldi (orig.). a, anus; a, anterior retractors; d, digestive tract; g, gonads; ni, mouth; «, nephridia; nc, ventral nerve cord; pr, posterior retractors. Fig. 267.—Larva (trochophore) of Echiurus (after Hatschek). a, anus; d, intestine; hw, postoral cilia; kn, protonephridia; m, mouth; mes, mesoderm bands with indication of segments; 11, ventral nerve cord; sc, cesophageal commissure; sp, apical plate; vw, preoral ciliated band. tropics. Most species burrow through the earth, swallowing the humus and casting the indigestible portions on the surface. They loosen the soil and con- tinually bring the deeper parts to the surface. Details of the reproductive organs of one species in fig. 265. These vary and are used in classification. Stib Class II. Gephyraa. The exclusively marine GephyrKa are distinguished at the first glance from the Cha;topoda by the absence of segmentation. The body is oval. 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
