. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IN I'\R\M|.( HM. 407 8, Fig. 6a and 6b in which the radiating vesicles ("taken by Khren- berg for seminal vesicles") are seen in the condition just before the systole of the vesicle, the canals being expanded. Dujunlin does not, of course, have anything to say about the matter, but his drawing could not be correct if the canals do not fill before the systole of the vesicle. The question above indicated therefore recurs, whence the fluid which fills the canals. As to this there was no doubt in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IN I'\R\M|.( HM. 407 8, Fig. 6a and 6b in which the radiating vesicles ("taken by Khren- berg for seminal vesicles") are seen in the condition just before the systole of the vesicle, the canals being expanded. Dujunlin does not, of course, have anything to say about the matter, but his drawing could not be correct if the canals do not fill before the systole of the vesicle. The question above indicated therefore recurs, whence the fluid which fills the canals. As to this there was no doubt in the minds of Claparede and Lachmann (1858) (Lachmann 1857 for 1856). It was these who held the view that the apparatus is the homologue of the circulatory apparatus in the more differentiated animals and. lr conception and thereby their critics, in overlooking what they did see, fell into an error as grievous, namely, in failing to see that the canals are in the first instance filled at the expense of the vesicle, as we hold. Lachmann's description (1857) will serve our turn at the moment. He says (1857, p. 224), maintaining that the thin area of the body wall over the vesicle is only a thin place fit for diffusion and with no opening, that when the vesicle is fully expanded the canals are fine lines. By the sudden contraction of the vesicle, however, the canals instantly swell into pyriform spaces close to the contractile vesicle, which has disappeared. During the slow reappearance of the vesicle, the canals gradually decrease and they have again been reduced to fine lines by the time the vesicle has become fully inflated. It must be clear that Lachmann believed that the swelling of the canals is synchronous with the early period of systole of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biol
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
