Archive image from page 72 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex4cpt11daniuoft Year: 1899-1953 Textfig. 21. Thyonidium barthii, 'Ingolf', St. Hi', small specimen. â 60. 1, left dorsal radial. 2, left ventral radial with the adjoining interradials. :>, mid-ventral radial with the left ventral interradial. lacking, and only the shape of the mid-ventral radial indicates that a radial tentacle is developing. Of the figures (textfigs. 20 and 21) it is easily seen how clearly the number and arrangement of the tentacles may be made out from the s
Archive image from page 72 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex4cpt11daniuoft Year: 1899-1953 Textfig. 21. Thyonidium barthii, 'Ingolf', St. Hi', small specimen. â 60. 1, left dorsal radial. 2, left ventral radial with the adjoining interradials. :>, mid-ventral radial with the left ventral interradial. lacking, and only the shape of the mid-ventral radial indicates that a radial tentacle is developing. Of the figures (textfigs. 20 and 21) it is easily seen how clearly the number and arrangement of the tentacles may be made out from the shape of the calcareous ring. The calcareous deposits of the large specimen are partly of dissolution of the deposits in the largest specimen was a natural process due to age. To tins I must say I) Tie- appearance of the dissolution indicates acidity and not a biological process. 2) Not only the deposits of the body wall but also those of tin- intro as wcdl as the end-plates of the pedicels (deposits which are alv present in large specimens of commune) are attacked by the arid. 3) There an- in the collections of the Zoological Museum specimens of Thyonidium from Greenland, of more than three times the length which have the deposits oi the body wall I acid fragments of such) persisting. At first sight these specimens, all appear to be Trochel's species barthii, bul tic calcareous deposits differ slightly from those of the various specimens of supposed barthii examined for the preparation of the report on the Echinoderms of the Thule Expedition (op. cit.). Especially the two sizes of tables so characteristic of the East Greenland and South-West Greenland specimens do not appear to he so distinct here, if ind 1 there really is more than one size of tables m the 'Ingolf' specimens. This may be due to the very minute size of the three specimens, tin' fourth heme, a- stated, so much attacked by acid that its tables cannot be closely studied. On account of the minute size of the three
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Keywords: 1890, 1899-1953, archive, arctic_regions, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, copenhagen_h_hagerup, danish_ingolf_expedition_1895_1896_, drawing, historical, history, illustration, image, k_benhavns_universitet_zoologisk_museum, marine_animals_arctic_regions, page, picture, print, reference, scientific_expeditions, university_of_toronto, vintage, zimmermann_a_albrecht_b_1860
