Archive image from page 200 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5apt1a4daniuoft Year: 1899-1953 CTENOPHORA. 71 audi noch werden, dass sich das Tier so kontraliiereii kann, dass aus der kugeligen Form eine zvlin- drische wird, wobei die inneren Organe sich in die Lange strecken und teilweise zuzaniineuriicken, z. B. die Tentakelbasen sich dem Magen naherii' (p. 144). My observations are iu full accordance herewith. In fig. 13 aâb are figured a pair of specimens showing such great differences in the arrange- ment of the radial canals of the g
Archive image from page 200 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5apt1a4daniuoft Year: 1899-1953 CTENOPHORA. 71 audi noch werden, dass sich das Tier so kontraliiereii kann, dass aus der kugeligen Form eine zvlin- drische wird, wobei die inneren Organe sich in die Lange strecken und teilweise zuzaniineuriicken, z. B. die Tentakelbasen sich dem Magen naherii' (p. 144). My observations are iu full accordance herewith. In fig. 13 aâb are figured a pair of specimens showing such great differences in the arrange- ment of the radial canals of the gastrovascular system, that one would scarcely think it possible that they could belong to the same species. Especially the direction of the main transverse canals is differ- ent, in one (a) horizontal, in the other (b) nearly vertical; similarly the position of the tentacle base is at the level of the upper end of the pharynx in one, nearly at the middle of the pharynx in the other specimen. Also the shape is very different, the one nearh' spherical, the other subcylindrical. But all transitions between these two extremes occur among the specimens from one and the same locality, so that there cannot be any doubt that these differences are due either to individual variations or to the different stages of contraction on preservation (or to both). 1 have not had occasion to examine any large number of specimens of this species in a living state, so I cannot say definiteh' whether such differences really occur in the living specimens; but for nn- own part I do not doubt that these dif- ferences are mainly due to the contraction on preservation. Likewise I suppose that the more cylin- drical shape, which Dr. Moser suggests to represent a growth change, is due to the preservation. â Observations on living specimens are necessary to decide these questions. A peculiar variation was found in a few specimens, viz. the infundibular canal being split up in a greater part of its length (F
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Keywords: 1800, 1890, 1899-1953, archive, arctic_regions, book, bookauthor, bookcentury, bookcollection, bookcontributor, bookdecade, bookpublisher, booksubject, bookyear, copenhagen_h_hagerup, danish_ingolf_expedition_1895_1896_, drawing, gerstein, gerstein_university_of_toronto, historical, history, illustration, image, k_benhavns_universitet_zoologisk_museum, marine_animals_arctic_regions, page, picture, print, reference, scientific_expeditions, toronto, vintage
