,- HYDROIDA 



6^ 



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, Om Ammeslsegten Corymorpha. 

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



p. 396. 

 1876 Aiiialf/ia-a islandica, Allman, Diagnoses of new Genera and Species of Hydroida, p. 256, PI. 



IX Fig. 5-6. 

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

 Nee 1893 Amalth(Fa islandica, lycvinsen, 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 pohp where its width reaches its minimum. The polyp has a broad ba.se, surrounded by a 

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

 small and nunierou.s, 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 ape.x of the blastostyle. 



Material : 



Iceland, 0fjord (without particular data). Original specimen of Amalthaca islandica. 

 ?The Kara Sea ("Dijmphna". Particular data are wanting). L,abelled Tubularia rcgalis. 



The original specimen in hand of Amalthaca isla)idica 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 unquestionaljle Corymorpha and no Tubularia; indeed, everything suggests that 

 it is a Corymorpha glacialis, l)ut 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), ^"^ from Spitzbergen (Broch 1909). But the species also penetrates into warmer water 



