. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Porifera. II. By William Lundbeck. THE present work, as shown by the title, is a direct continuation of my work, « Porifera, Part I, The Danish Ingolf-Expedition, VI, i, published in 1902. In the introduction to this first part I rendered an account of the material and of the geographical territory treated in the work. Since that time some new material from the territory has been added, and this material has been included in the work. The new material has especially been gathered by the surveying vessels the «Diaua» and Besk
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Porifera. II. By William Lundbeck. THE present work, as shown by the title, is a direct continuation of my work, « Porifera, Part I, The Danish Ingolf-Expedition, VI, i, published in 1902. In the introduction to this first part I rendered an account of the material and of the geographical territory treated in the work. Since that time some new material from the territory has been added, and this material has been included in the work. The new material has especially been gathered by the surveying vessels the «Diaua» and Beskytteren > stationed at Iceland and the Faroe Islands, on the cruise of the «Thor», the steamer of the international investigation of the sea, in 1903 under the direction of Dr. Joh. Schmidt, aud more particularly must be mentioned the very considerable material collected by Dr. A. Appellof and cand. mag. Ad. Jensen during the cruise of the Michael Sars in 1902 under the direction of Dr. Hjort. In the first part of the work the families Homorrhaphida and HetcrorrhaphidcE of the sub-order Haliclwndrince were treated. The present part comprises part of the family. Desmacidonidce. Partly tollowing Topsent I divide this family into the subfamilies Mycalincc (= Esperellince olim) and Ecty- onincB; Mycalinm I divide into two groups Mycalea and Myxillea (the latter corresponding to the subfamily Dendoricinm of Topsent). I regard these two divisions as groups of one subfamily, as I think them more closely allied to each other than to Ectyonina, at all events when the question is of the typical forms of this sub-family. On the other hand, several genera of EctyonincB are assuredly closely allied to genera of the group Myxillecv. The systematism of the sponges is still in main- respects groping its way, aud such is also the fact inside the family Desmacidonidce. The separation into the two subfamilies Mycalincr and EctyonincB is scarcely a quite natural one, in the way in which it
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