Opalina : its anatomy and reproduction, with a decription of infection experiments and a chronological review of the literature . e individual a bit of the proto-plasm containing one to four nuclei separatesitself from the rest of the protoplasm andforms a cyst around itself, being then ex-truded from the body —, 3) conjugationcysts — two individuals like those of theordinary cysts come together by their anteriorends, lie for a long time rubbing againsteach other and turning, and then form acyst enclosing them both, each animal occu-pying half of the cyst. [These remarkablephenomena of the for
Opalina : its anatomy and reproduction, with a decription of infection experiments and a chronological review of the literature . e individual a bit of the proto-plasm containing one to four nuclei separatesitself from the rest of the protoplasm andforms a cyst around itself, being then ex-truded from the body —, 3) conjugationcysts — two individuals like those of theordinary cysts come together by their anteriorends, lie for a long time rubbing againsteach other and turning, and then form acyst enclosing them both, each animal occu-pying half of the cyst. [These remarkablephenomena of the formation of the secondand third kinds of cysts have not beenobserved by other students. Leger & Duboscqs very brief un-illustrated description can hardly be accepted without confirmation.]Fauee-Feemiet (1904), in a brief discussion of the structure ofprotoplasm, refers to Kunstlees [Kunstlee & Ginestes] idea ofthe vesicular structure of protoplasm. He says that the vesiclesof KuNsi LEE [in part refractive spherules of the endosarc in 0. dimidiataand other Protosoa] are not inclusions, are not reserve food, are not. Text Fig. individual of 0. satur-naliH figured by LSgee &DuBOSCQ. Doubtless it wasa microgamete or a micro-gamete 600 diameters. Opalina. 339 excretory vesicles. [Several diifeient unrelated structures seem tobe included under the term vesicles as here used. The endosarcspherules of Opalina seem to be composed, chiefly at least, of para-globuliu and to be a reserve food supply. The often reiteratedconceptions of Kunstler & Gineste and Faurk-Fkemiet seem there-fore to be founded on an insecure foundation.] KuKSTLiR & Gineste (1905) discuss the refractive spherules ofthe endoplasma in 0. dimidiata; they say that they divide by con-striction, a central granule in each dividing fiist [not confirmed byNeresheimer or myself]^ They estimate eight thousand of thesespherules to be present in an 0. dimidiata 112/.^ long by 87^2 i^*broad. These spher
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