. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Ordo Dendrochirota. Family Phyllophoridae. Mortensen 1927: British Echinoderms p. 408. Deichmann 1930: Holothurians of the Atlantic Ocean p. 140. Engel 1933: Resultats Scientifiques du Voyage aux Indes Orien- tals Neerlandaises, Holothuries p. 13-38. 1936: Echinoderms, 6. og 7. Thule Expedition p. 19-26. Deichmann 1938: Holothurians from the Western Coast of Lower California etc. p. 378. Three different genera of the family Phyllophoridae have been already recorded from the norther
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Ordo Dendrochirota. Family Phyllophoridae. Mortensen 1927: British Echinoderms p. 408. Deichmann 1930: Holothurians of the Atlantic Ocean p. 140. Engel 1933: Resultats Scientifiques du Voyage aux Indes Orien- tals Neerlandaises, Holothuries p. 13-38. 1936: Echinoderms, 6. og 7. Thule Expedition p. 19-26. Deichmann 1938: Holothurians from the Western Coast of Lower California etc. p. 378. Three different genera of the family Phyllophoridae have been already recorded from the northern Atlantic, viz. Pseudocucumis — Thyonidium — Phyllophorus. Of these the genus Pseudocucumis is not recorded from the area explored by the "Ingolf", nor was it taken by this expedition. As to the two other genera Thyonidium and "Phyllophorus" there has been much discussion as to whether they should be separated or they are in reality identical. In 1930 Deichmann collected all the Phyllophoridae with more than ten tentacles in the old genus Phyllophorus, but in 1938 her extensive studies of this group resulted in the establishing of a number of well defined genera. In spite of this Deichmann is not convinced that I am right in stating that the two North Atlantic species pellucidus and commune must be referred to two different genera. The main reason for her disagreement is the fact that in 1936 when I re- established the genus Thyonidium I left the species commune in the genus Phyllophorus where Deichmann some years before had placed it, and this only because I had then neither time nor material for such extensive studies as those undertaken by Deich- mann in the following years. I quite agree with Deichmann that commune is no Phyllo- phorus sensu stricto, but I must maintain that neither can it be referred to Thyonidium. The difference in the number of ten- tacles alone is definitely against so doing, and my renewed studies based on the "Ingolf"
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