Archive image from page 114 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 HYDROIDA II 107 Sertularella rugosa must be characterised as a boreal species, having its bathymetrical distri- bution in the upper half of the littoral region, though it does not often penetrate up into the tidal zone. Kirchenpauer (1884) records it as found at Greenland, but there are no subsequent finds recorded from there. In the areas investigated (fig. LVIII) it has, it will be seen, an easterly distri- bution from Iceland to up in the Barents Sea, but it
Archive image from page 114 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 HYDROIDA II 107 Sertularella rugosa must be characterised as a boreal species, having its bathymetrical distri- bution in the upper half of the littoral region, though it does not often penetrate up into the tidal zone. Kirchenpauer (1884) records it as found at Greenland, but there are no subsequent finds recorded from there. In the areas investigated (fig. LVIII) it has, it will be seen, an easterly distri- bution from Iceland to up in the Barents Sea, but its occurrence in the purely arctic area is quite sporadic, while on the west coast of Norway, for instance, it is a characteristic species in the laminaria zone. New finds are those from the Faroe Islands, where the species might be expected to be found from its occurrence off the coasts of Iceland, the British Isles, and Norway. 200 m. . 600 m. ._ 1000m. Fig. LVIII. Distribution of Sertularella rugosa in the Northern Atlantic. In the hatched regions a common occurrence is noted. Diphasia Agassiz. Upright colonies, the hydrotheca; having a horizontal or, slightly obliquely situated aperture without distinct teeth, but as a rule witli an adcauline sinus, in which the large single opercular plate is attached. The polyps have, as far as can be seen from external observation, no abcauline blind sack. This definition differs in one important feature from that given by Lev ins en (1913 p. 309), the organisation of the polyps being taken into consideration. We thus obtain a stronger and more natural limitation, and the genus then practically coincides with the group Eudiphasia Broch. It has long been a doubtful question whether the two groups Eudiphasia and Abietinaria should be assigned generic rank or not, attention having previously been paid only to the form of the hydrotheca as the decisive point, and distinction thus made between species having more cylindrical hydrotheca; or
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