HYDROIDA 



37 



respect is the individual nr. lo of the first table, the leiio;th of the blastostyles varying from 5 to 18 

 mm., and the thickness being inversely proportional lo the length. The rest of the distinguishing 

 characters fall under what has been earlier stated. 



Coryiiiorplia grocnlandica is a typical form characteristic of the great deep of the cold area. It 

 proves to be widely distributed, from Spitzbergen to the Faroe Islands, and from Norway to Green- 

 land. It has also been recorded from Davis Strait. In the seas far to the nortli it rises to more shallow 

 waters. Thus it has been recorded near Spitzbergen at the depth of only 45 metres (Broch 1909). 

 A remarkable geographical exception is formed by the occurrence of the species in the deeper Atlantic 



.- (000 m. 



Text-fi}:. I. Localities of Coryinorpha grocnlandica in the Northern Atlantic. 



strata of the Trondhjem fjord. At present the occurrence of the species in this locality 

 accounted for. But a great deal may be said in favour of the notion that we ha\c here 

 relict form, which has been able to accommodate itself to the altered circumstances in the 

 as Tubularia rcgalis Boeck and Stcgopoma pluatile (M. Sars) which arc rather frequently 

 on or at the Loplioliclia reefs of the fjord. 



cannot be 

 in hand a 

 same wav 



Corymorpha .sp. indet. 

 Indeterminable remnants of species of Corymorplia occur from the following localities: 

 "Ingolf St. 28, 65°i4' N., 55°42' W., depth 420 fath., + 3°5 C, attached to the tube of a Pectinaria. 

 — -124, 67°4o' - i5°4o' - - 495 - -^ o°6 - 



