. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. I quite agree with LuDWIG that the different varieties of Cucumaria abyssorum described by Theel are only developmental stages, and with this variation taken into consideration I have no doubt that the present specimens, previously mentioned as ,, are but Atlantic specimens of Cabyssorum. Further this does not leave any doubt that Ohshima's species, C. sluiteri, must also be regarded as a synonym of C. abyssorum; then- are. in fact, mi differences between these two species. Textfig
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. I quite agree with LuDWIG that the different varieties of Cucumaria abyssorum described by Theel are only developmental stages, and with this variation taken into consideration I have no doubt that the present specimens, previously mentioned as ,, are but Atlantic specimens of Cabyssorum. Further this does not leave any doubt that Ohshima's species, C. sluiteri, must also be regarded as a synonym of C. abyssorum; then- are. in fact, mi differences between these two species. Textfig. 36. Abyssocucumis abyssorum ("Ingulf", St. 36). /, the anal opening with the posterior end of two large plates and some spicules. 2, rods from the tentacles. X 60. Family Psolidae. Genus Psolus Oken. In the "Ingolf" collections the genus Psolus is represented by the following five species: phantapus (Strussenfelt) fabricii (Diiben & Koren) squamatus Koren pourtalesii var. dyscritus n. var. hypsinotus n. sp. Of these fabricii and squamatus are represented by some very small specimens the determination of which is consequently not quite certain, especially since the juvenile stages are hitherto unknown, and Ekman has even tried to show that P. valvatus Ostergren is the juvenile stage of P. squamatus. Though the determination of these two species is not certain, the presence of small Psolus with supplementary small scales at the inner side of the large oral scales indicates that Ekman cannot be right in his supposition that a species like valvatus is the young of squamatus; consequently these small specimens also indicate that the specimens described as P. hypsinotus are in reality a valid species. The validity of the new variety of /'. pourtalesii is not very convincing, but on account of the state of our knowledge of the classification of Psolids, I do not find it safe to refer these specimens to pourtalesii, since there are differences, the classificat
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
