Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 Fig. 255,—Developmental history of Dhfomum (partly after R. Leuckart). n, free swimming ciliatetl embryo of the liver fluke, b, the same in a state of contraction \-ith rudimentary alimentary canal {DJ and cell mass (Oo) (rudiments of the genital glands). Ejt, ciliated apparatus of the rudimentary excretory system, c, sporocyst developed from a Distomum embryo, filled with Cercarias (C); JS. Boring spine of a Cercaria. il Eedia with pha
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 Fig. 255,—Developmental history of Dhfomum (partly after R. Leuckart). n, free swimming ciliatetl embryo of the liver fluke, b, the same in a state of contraction \-ith rudimentary alimentary canal {DJ and cell mass (Oo) (rudiments of the genital glands). Ejt, ciliated apparatus of the rudimentary excretory system, c, sporocyst developed from a Distomum embryo, filled with Cercarias (C); JS. Boring spine of a Cercaria. il Eedia with pharynx, (Ph), and alimentary canal (D); O, mouth; Ex, Excretoi-y organ; C, Cercaria inside Redia, e, Free Cercaria ; S, sucker ; D, alimentary canal. sporocyst or redia], which probably correspond to the germinal cells (primitive ova) of the rudimentary ovary, to the generation of the * As R, Leuckart has ri,t^htly observed, the Dlcyemidfc, which were regarded as Mi'xozoa by Ed. v. Beneden, as well as the Ortlioncctidcv, which have recently been especially investigated by Giard and E, Metschnikoff, and which in the reproductive stage do not rise above a form corresponding to the embryos of Trematodes, recall those Distomum larvae.
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