Text-book of comparative anatomy . overing the whole dorsal integument of the last 5 thoracic seg-ments, or of the last thoracic segment, is not united thoracic shield • M. mi. o • f j--u • f f t Sth thoracic segments; «Zh-«&-, abdo- with it. The 8 pairs of thoracic feet are formed mmal segments ; prp6, plei tpoda; 6r,pretty much alike, and are biramose (with exopodite giliSi and endopodite); we can, however, generally describe the 2 anterior pairs of thoracic feet as foot-jaws, as they may have masticatoryridges. Abdomen strong, slender. Pleopoda very small in the female, stron
Text-book of comparative anatomy . overing the whole dorsal integument of the last 5 thoracic seg-ments, or of the last thoracic segment, is not united thoracic shield • M. mi. o • f j--u • f f t Sth thoracic segments; «Zh-«&-, abdo- with it. The 8 pairs of thoracic feet are formed mmal segments ; prp6, plei tpoda; 6r,pretty much alike, and are biramose (with exopodite giliSi and endopodite); we can, however, generally describe the 2 anterior pairs of thoracic feet as foot-jaws, as they may have masticatoryridges. Abdomen strong, slender. Pleopoda very small in the female, stronglydeveloped in the male. The last pair of pleopoda, well developed in both sexes,forms with the telson a rowing or swimming fin. Marine. Family 1. Mysidse. Thoracic feet without gills, the first pair with large vibratile epipodial 5 thoracic segments free under the dorsal shield. Auditory organs in theendopodites of the 6th pair of pleopoda. Jlysis, SiricUa (Fig. 201) ; in the male,gills on the FIG. 201.—Siriella Thompson!!,male (after G. 0. Sars). cth, Cephalo-VII, VIII, 7th and 298 COMPARATIVE AX ATOMY CHAP. Family 2. branchial tufts on the thoracic feet; last 5 thoracic segments as in the Mysuhc. Lophocjaster. Family 3. Euphausidse. With branchial tufts on the thoracic feet. Only the last thoracic segment isfree under the dorsal shield. Euphausia, Thysanopoda.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
