. A manual of zoology. Zoology. LVLi CCELIIELMIXTIIES. Order I. Polychaette. The Polvcha-ta? owe their name to the fact tliat each group of bristles contains many chxtx; but more important is that the liristk^s of each side are supported l)v a lleshv outgrowth of the somite, the parapoJiiiDi, in whieli two por- tioits corresponding to the bunches of bristh'Sâdorsal, iiolopoiiiiiiii: \'entral, iniiro- podiiiJiiâmay be recogni/ed (fig. -54). This is the I'lrst appearance of true appen- dages, but they chifer from those of Arthro- poda in iiot being joiitted to the body nor jointed in themsehes.
. A manual of zoology. Zoology. LVLi CCELIIELMIXTIIES. Order I. Polychaette. The Polvcha-ta? owe their name to the fact tliat each group of bristles contains many chxtx; but more important is that the liristk^s of each side are supported l)v a lleshv outgrowth of the somite, the parapoJiiiDi, in whieli two por- tioits corresponding to the bunches of bristh'Sâdorsal, iiolopoiiiiiiii: \'entral, iniiro- podiiiJiiâmay be recogni/ed (fig. -54). This is the I'lrst appearance of true appen- dages, but they chifer from those of Arthro- poda in iiot being joiitted to the body nor jointed in themsehes. On the dorsal sur- face may occur chverse outgrowths, known, according to position or function, as cirri, elvtra, gills, etc.; on the head, palpi and tentacles. The cirri are long processes on the parapodia, and like palpi are tactile (fig. 254). Elytra are thin lamelki: wliich cover tire back like shingles and thus protect the liody (kg. 2O2). Nearly all Polychates are dioe- cious and undergo a more or less pronounced metamorphosis; with few exce[itions (Ma)ivinikia'^ from the Schuylkill, .V(7-(/,';* in California) they are marine. 1 liev arc usually â "^ss^ Fig. 260.âHead with ]iro- truded pharynx of A'tft/.j vcrsipcdatj (after ). c, cirri, k, jaws; I, head with eyes; p, palpi; t, 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
Size: 1531px × 1632px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
