32 



HYDROIDA 



morpha, to be in fact a young colony of Corymorpha nutans. Remarkably enough, the species has 

 not yet been met with at the Faroe Islands; but it has been found several times on the west side of 

 Iceland. At Greenland it is not likely to occur; nor has the species as yet been recorded from this 

 locality. 



Corymorpha glacialis M. Sars. 



1859 Corymorpha glacialis, M. Sars, Ora Ammeslsegten Corymorpha. 



1872 Monocaulus glacialis, Allman, A Monograph of the Gymnoblastic or Tubularian Hydroids, 



P- 39 6 - 

 1876 Amaltlura islandica, Allman, Diagnoses of new Genera and Species of Hydroida, p. 256, PL 



IX Fig. 5-6. 



? 1887 Tubularia rcgalis, Bergh, Goplepolyper fra Kara-Havet. 



Nee 1893 Amalthwa islandica, Levinsen, Meduser, Ctenophorer og Hydroider fra Gronlands Vestkyst, 



p. 151. 



The hydrocaulus, when extended, attains a height of 100 mm. It is wide at the base, where 



it is attached to the substratum by numerous rhizoids, and is gradually tapering upwards till closely 



below the polyp where its width reaches its minimum. The polyp has a broad base, surrounded by a 



whorl of up to 50 tentacles, which, when extended, attain a length of 30 mm. The distal tentacles are 



small and numerous, placed round the orifice in a main whorl formed by several irregular and closely 



set circles. 



The gonophores are eumedusoid, with four radial canals, but without rudiments of tentacles. 



They are sessile. The gonophores are scattered all over the surface of 30—35 unbranched blastostyles, 



the oldest and most developed ones at the apex of the blastostyle. 



Material : 



Iceland, Ofjord (without particular data). Original specimen of A ma Ithaca islandica. 

 ?The Kara Sea ("Dijmphna". Particular data are wanting). Labelled Tubularia rcgal/s. 



The original specimen in hand of Amalthaca islandica Allman (1876) proves as clearly as de- 

 sirable that this species is wholly identical with Corymorpha glacialis. Allman, certainly, states that 

 the gonophores of the species are provided with four short tentacles, which are also, in his rather 

 skeletonlike drawings, delineated as rather considerable formations. But in the original specimen can 

 only in some straggling gonophores be pointed out some accidental wrinkles, which, when acting in 

 good will, we may consider as the origin of the rudimentary tentacles stated. Other divergencies from 

 the typical Corymorpha glacialis are, on the whole, not traceable. 



A specimen from the Kara Sea has been identified by Bergh (1887) as Tubularia rcgalis Boeck. 

 The specimen is an unquestionable Corymorpha and no Tubularia; indeed, everything suggests that 

 it is a Corymorpha glacialis, but the state of preservation impedes a safe identification. 



According to the particulars in hand Corymorpha glacialis is indigenous mainly to Arctic wa- 

 ters. It has been recorded from the Varanger fjord (M. Sars 1859), from Nova Zembla (Maren- 

 zeller 1877), and from Spitsbergen (Broch 1909). But the species also penetrates into wanner water 



