. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Textfig. 25. The outline of various specimens of Ypsilothuria. 1, Ypsilothuria bitentaculata attenuata ("Godthaab"). 2. Ypsilothuria biten- taculata attenuata ("Ingolf", St. 37). 3, Ypsilothuria bitentaculata attenuata ("Ingolf", St. 67). -/. Ypsilothuria bitentaculata attenuata ("In- gulf", St. • >T). 5, Ypsilothuria talismani lalismani ("Ingolf", St. Id). 6, Ypsilothuria talismani talismani ("Ingolf", St. 73). 7, Ypsilothuria
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Textfig. 25. The outline of various specimens of Ypsilothuria. 1, Ypsilothuria bitentaculata attenuata ("Godthaab"). 2. Ypsilothuria biten- taculata attenuata ("Ingolf", St. 37). 3, Ypsilothuria bitentaculata attenuata ("Ingolf", St. 67). -/. Ypsilothuria bitentaculata attenuata ("In- gulf", St. • >T). 5, Ypsilothuria talismani lalismani ("Ingolf", St. Id). 6, Ypsilothuria talismani talismani ("Ingolf", St. 73). 7, Ypsilothuria bitentaculata virginiensis (Frederikssted). 8, Ypsilothuria talismani elegans (Frederikssted I. 9 and 10, Ypsilothuria bitentaculata i Indo-Pacific specimen i. The spicules of the tentacles are fairly solid spiny staves, with one, two, or no perforations in the ends (textfig. 28 1-2). The shape of these spicules is clearly different from that of the deposits of the tentacles in the different forms of Y. bitentaculata (textfig. 30). Ltjdwig states (1894 p. 146) that the tube-feet tacuiata penetrate the large plates of the body wall, and it is supposed that this feature may be characteristic for the genus Sphaerothuria (i. e. Ypsilothuria) and separates it from Echino- cucumis. It is to be expected that the tube-feet should penetrate the large perforated plates, as these are placed so closely that there is no room between them; that this feature is, however, to be regarded as accidental is seen from the specimen from the "Thor" (St. 167) where there are also tube-feet which are placed between the plates of the body wall (cf. textfig. 2'j l). It appears at first sight that this little specimen is not Ypsilothuria but an also a single specimen from the West Indies (Frederikssted 20/i 1906, 375 m, coll. Th. Mortensen) which in all details agrees with the specimens from the North Atlantic, and must be referred to the same species and form. This indicates tha
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
