Text-book of comparative anatomy . -— (L. FIG. 31t3.—.4 and 1; Hydrophilus embryos witti the rudiments of extremities (after Heider).In the somewhat older embryo, B, the rudiments of abdominal feet, which disappear later, can bevery distinctly seen ; a, anal aperture ; an, antenna ; g, rudiment of the ventral ganglionic chain ; TO,oral aperture, md, Mandible ; mx\, 1st maxillae ; inxn, 2d maxillae (rudiment of the lower lip) ; pi,P2> Ps> thoracic pairs of legs ; p4, p5, p?, p9, rudiments of extremities of the 1st, 2d, 4th, and tlthabdominal segments ; st, stigmata ; vk, procephalon. trun
Text-book of comparative anatomy . -— (L. FIG. 31t3.—.4 and 1; Hydrophilus embryos witti the rudiments of extremities (after Heider).In the somewhat older embryo, B, the rudiments of abdominal feet, which disappear later, can bevery distinctly seen ; a, anal aperture ; an, antenna ; g, rudiment of the ventral ganglionic chain ; TO,oral aperture, md, Mandible ; mx\, 1st maxillae ; inxn, 2d maxillae (rudiment of the lower lip) ; pi,P2> Ps> thoracic pairs of legs ; p4, p5, p?, p9, rudiments of extremities of the 1st, 2d, 4th, and tlthabdominal segments ; st, stigmata ; vk, procephalon. truncated feet (anal feet) of the larra of butterflies and wasps are not rather theremains of real limbs than new formations. C. The Wings. Wings are altogether wanting in the Myriapoda. Among the Apterygota, as their name implies, are entirely neither the adult Apterygota nor the embryos at any stage oftheir development have wings or organs belonging to wings, we arejustified in assuming that their ancestors al
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
