Archive image from page 372 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5cpt9daniuoft Year: 1899-1953 MEDUSA. 11. 93 counted more than about So tentacles. — l)e\elopnient of the tentacles: One of the smallest individuals in the present material ('Thor' stat. 176 (03), Iceland, loc. 2) is 6 nun in diameter and has 16 tentacles regularly arranged; 4 ])erradial, 4 inlerradial, and 8 adradial, the latter being comparatixel}- large; further a very small rudiment in each of the i() interspaces. Another iiidi\'idual of the same size ('TJior' stat. 11 (08)
Archive image from page 372 of The Danish Ingolf-expedition (1899-1953). The Danish Ingolf-expedition danishingolfex5cpt9daniuoft Year: 1899-1953 MEDUSA. 11. 93 counted more than about So tentacles. — l)e\elopnient of the tentacles: One of the smallest individuals in the present material ('Thor' stat. 176 (03), Iceland, loc. 2) is 6 nun in diameter and has 16 tentacles regularly arranged; 4 ])erradial, 4 inlerradial, and 8 adradial, the latter being comparatixel}- large; further a very small rudiment in each of the i() interspaces. Another iiidi\'idual of the same size ('TJior' stat. 11 (08), loc. 9) has likevvise 16 tentacles and 16 rudiments, but the arrangement is different from that in the former indi\'idual; in two opposite quadrants there are one well- developed interradial tentacle and 2 small adradial ones, but in each of the two other opposite quadrants tliere are 2 tentacles of 2nd order, dividing tJie quadrant into three equal parts, and besides a I'ig. 37, Ncoiurris pUcaia. Diagram illustrating small interradial tentacle of jrd order; thus in these two ([uadrants the successive development of the tentacles in a young individual with lO tentacles; iu this the arrangement is duodecimal (see the diagram, texttig. ;/); the .specimen the arrangement is octagonal in two opposite quadrants, duodecimal in the two other formula of development is: 4 + 6 + 6 = 16. The number of 16 ,j„adrants. Formula of development .,4-6 + 6 may be attained in different ways: = 16. Comp. the text. II III tot. 4 8 16 8 4 16 6 6 16 Arrangement jjurely octagonal 4 — duodecimal 4 — mixed 4 As to the further development of the tentacles, we will find that it soon becomes very irregular. A regular alternation of large and small tentacles or of fully developed tentacles and tiny rudiments is never seen in Ncu/iirris pilcaia after it has passed a rather young stage of development. We may shortly state that a Neotuyyis, after having reached a certain size, has as many tentacles
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Keywords: 1890, 1899-1953, archive, arctic_regions, book, bookauthor, bookdecade, bookpublisher, 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, vintage
