HVDROIDA 



25 



Tnhularia indivisa being globular, and accordingly broadh' rounded in the distal part, while that of 

 Tiihdaria regalis is oval and showing an attempt to be pointed in the distal part. 



Tubidaria indivisa has a ver\- wide distribution. Its main occurrence in the boreal seas is bound 

 to the middle and deeper parts of the littoral region and to the upper part of the deep sea region. 

 From the cold area we find the species but once recorded, by (irieg (1914). After the examination 

 of his specimens I cannot confirm this record; the specimens consisting only of hydrocauli without 

 polyps, more probably belong to another species of Tiibularia inhabiting the deep sea. 



To judge from literature, Tiibularia indivisa penetrates rather far into the shallower parts of 

 the Arctic regions, where it is recorded even from the New Siberia Islands (Jiiderholm 1908). How- 

 ever, as apjDcars from what is stated above, there is a possibility that sonic of the Arctic individuals 



600 m. 



Text-fig. D. The distribution of Tuinlaria indivisa in the Northern .'Atlantic. 



are in fact to be referred to Tnbnlaria regalis. — The species also penetrates far towards the south. 

 It is recorded by Fewkes (1881) even from the Caribbean vSea, by A 11 man (1877) from between Cuba 

 and Florida, and by Billard (1906) from the west coast of Africa. As Tiibularia indivisa is recorded 

 at the same time both from the East and the West coast of North .Vmerica, it must be characterized 

 as a circumpolar or rather "circumboreal" (Nordgaard 1912) species. 



Tubularia regalis Boeck. 

 i860 Tiibularia regalis Boeck, Videnskabsselskabets ForhandHuger for 1859. 

 1899 — — -|- T variabilis Bonne vie, Norske Nordhavs-Expedition, p. 24. 



Colonies whose long, dark-brown-coloured hydrocauli are in the lower parts twisted together. 

 The stem is covered with a vigorous periderm, but shows no rings nor wrinkles. No collar is formed 



The Ingolf-Expedition. V. 6. 



