. A manual of zoology. Zoology. 3S4 ARTHROPODA leaping motion, whence the common name, lieach fleas. In swimming tlie alidomen is ahernately bent against the lireast and then forcibly straightened. The boiiy is usually strongly compressed from side to side. The anterior thoracic feet generally bear large i-pimcral plates (iig. A}:-.), which e.\tend the sides of the down«-ards, while on the inner side delicate gills or gill sacs (lig. 410, /';•) arise from their bases. In the female brood lamelke (brl) are added wliich enclose a brood chamber beneath the body in wliich eggs or young are c
. A manual of zoology. Zoology. 3S4 ARTHROPODA leaping motion, whence the common name, lieach fleas. In swimming tlie alidomen is ahernately bent against the lireast and then forcibly straightened. The boiiy is usually strongly compressed from side to side. The anterior thoracic feet generally bear large i-pimcral plates (iig. A}:-.), which e.\tend the sides of the down«-ards, while on the inner side delicate gills or gill sacs (lig. 410, /';•) arise from their bases. In the female brood lamelke (brl) are added wliich enclose a brood chamber beneath the body in wliich eggs or young are car- ried. The three anterior pairs of ab- dominal feet are two-branched, richly haired, and serve to create currents of water wliich pass c^ver the gills. The remaining alidominal feet, through bira- mous, are shorter and stout and form springing organs. The position of the gills explains why the abdominal part of the heart is degenerate and only the anterior thoracic portion with three pairs of ostia persists. Sub Order I. ITATERIXA. Large head and eves; strong prchcnsil'^ feet. Live attached to other pekiLjic animals on which they feed; Hypcn'a,''' Plironima.* Sub Order II. GA^SOIARINA. Head much smaller; alidomen well developed; mostlv free swimmers. Numerous species in the sea. Canimanis''* in shallow water, some fluviatile; Orclicslia''' above tide marks. Clnliira *. Fig. 410, — Crrs5-section Ampliipode"('r()/)///f(;)/, (froni Lang, after Delage'). bf. thoracic leg; bm, ventral nerve conl: /ir, branch'ue; I'rl, brood lamella; 1/, intestine; /;. heart; /, liver; ov, eggs in brood 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
