Text-book of comparative anatomy . FIG. 315.—A ventral shield of Machilis maritima,with two protrusible saccules (c&) on each side. Onthe left the saccules are withdrawn, on the right pro-truded. hs, movable appendages (coxal spurs), musclesof the same and of the protrusible saccules (afterOudemans). Fio. 314.—Ventral side of the hind-body of a female Machilis rnaritima (after Oudemans).The left half of the 8th ventral shield is removed. , segments of the abdomen ; c, bristle-likejointed appendages (cerci) of the 10th abdominal segment; cb, protrusible saccules=coxal glands inthe act of d
Text-book of comparative anatomy . FIG. 315.—A ventral shield of Machilis maritima,with two protrusible saccules (c&) on each side. Onthe left the saccules are withdrawn, on the right pro-truded. hs, movable appendages (coxal spurs), musclesof the same and of the protrusible saccules (afterOudemans). Fio. 314.—Ventral side of the hind-body of a female Machilis rnaritima (after Oudemans).The left half of the 8th ventral shield is removed. , segments of the abdomen ; c, bristle-likejointed appendages (cerci) of the 10th abdominal segment; cb, protrusible saccules=coxal glands inthe act of degenerating ; hs, movable appendages=coxal spurs, conjectural rudiments of abdominalfeet; Ir, ovipositors. processes on the abdominal segments of the Thysanura were by many observers atonce assumed to be degenerated abdominal feet. In the winged Hexapoda (Pterygota) rudiments of abdominal feet have also beenobserved. They appear at certain embryonic stages exactly like the rudiments ofthe thoracic feet, as prominences
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
