. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 162 ZOOLOGY. Fig. loll. â All annelid (Eunice). Anterior and posterior ends of the body only ; dorsal \ievi. fa, unpaired feeler; fp, paired feeler; a, eyes ; fc, feeler-cirri ; A", gills ; â pc, dorsal parapodia ; 7), para- podia ; ac, anal cirri. -VfterLang. ing certain parts of the body-wall and expanding others on the same side of the body at the same time, and this is possible only with short muscles. When the muscles run continuously from head to tail, as in the " vinegar eel," the body
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 162 ZOOLOGY. Fig. loll. â All annelid (Eunice). Anterior and posterior ends of the body only ; dorsal \ievi. fa, unpaired feeler; fp, paired feeler; a, eyes ; fc, feeler-cirri ; A", gills ; â pc, dorsal parapodia ; 7), para- podia ; ac, anal cirri. -VfterLang. ing certain parts of the body-wall and expanding others on the same side of the body at the same time, and this is possible only with short muscles. When the muscles run continuously from head to tail, as in the " vinegar eel," the body flops from one side to the other as a whole. The segmentation of the body has led to important consequences. Each segment contains not only its own muscles, but a pair of ap- pendages that are moved by the muscles, nerves to control the muscles, blood-vessels to supply them with food, and a pair of excretorjr organs to carry off waste products. Each segment is, in- deed, a nearl_y complete organism, and, consequentl}^, even small parts of an annelid cut out from the rest of the body may live a long time and even regenerate the lost head and tail. The head of the annelid is simple in the earthworm and the other herbivorous forms; but in Nereis and the other carnivorous species (Fig. 160) it gains a great size and is jDrovided with various sense. 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
Size: 912px × 2740px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
