. A manual of zoology. Zoology. I. CRUSTACEA: AMPIIIPODA. 4;j9 beach fleas. In swimming the abdomen is alternately bent against the breast and then forcibly straightened. The body is usually strongly compressed from side to side. The thoracic feet generally bear large epineural plates (fig. 433), which extend the sides of the body downward, while on the inner side delicate gills or gill sacs (fig. 449, hr) arise from their bases. In the female brood lamellas (f^i'l) are addedâIn'oad chitinous plates which enclose a brood chamber beneath the body in which eggs or young are carried. Tlie three a
. A manual of zoology. Zoology. I. CRUSTACEA: AMPIIIPODA. 4;j9 beach fleas. In swimming the abdomen is alternately bent against the breast and then forcibly straightened. The body is usually strongly compressed from side to side. The thoracic feet generally bear large epineural plates (fig. 433), which extend the sides of the body downward, while on the inner side delicate gills or gill sacs (fig. 449, hr) arise from their bases. In the female brood lamellas (f^i'l) are addedâIn'oad chitinous plates which enclose a brood chamber beneath the body in which eggs or young are carried. Tlie three an- terior pairs of abdominal feet are two-branched, richly haired, and serve to create currents of water Fio. 44a.âCross-section of Amphipod (Cnroimiunt). (trora nang, after I>i'- Which pass forward over the gills. lage.) /)/, thoracic lei;; hm, ventral â ^ . . *- nerve cord: fir, branchice; hrl, brood riie remaining thoracic feet, .lameUa; </, intestine; ;i, heart; !, liver; tn\ cKy:s In brood chamber. though biranioiis, are short 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 Sub Order I. IIYPEPJNA. Large head and eyes; strong prehensile feet. Live attached to olher peLigic animals on whieli they feed, llyperia. vKiJiisanim * lives on the jelly fish Cyaiiea; Phrorihna,* warniei' seas. Riib Order II. GAMMARINA. Head much smaller; abdomen well devel- oped; are mostly free swimmers. Numerous speeies in the sea. Gaiii-. 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. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
