ATLANT. DEEP-SEA EXPED. 1910. VOL. Ill] 



HYDROIDA. 



13 



Fig. 14. Map showing the distribution of southern hydroids in the Norwegian Sea and North Sea. 

 • Pliimularia and Schizotricha. O Nemertesia. -+- Aglaopheniidae. 



by arctic water. Near the Faroe-Channel, where the 

 warmer waters of the Gulf-Stream enter the Norwegian 

 Sea, the records are clustered together, and this would 

 doubtless be the case also along the coasts of Ireland 

 and Scotland, had the authors given detailed localities 

 instead of vague statements, such as "west coast of Ire- 

 land", "coasts of Scotland below tide-mark", etc., which 

 could not be utilised in preparing the map. 



At the mouth of the submarine channel along the 

 west coast of Norway the localities are also rather densely 

 crowded, as well as in the Trondhjemfjord, where atlantic 

 or lusitanic species occur in such quantities as are abso- 

 lutely unknown at any other point of the Norwegian coasts. 

 — The northernmost localities situated along the conti- 

 nental edges where the Murman Sea borders the deep 

 basin of the Norwegian Sea are of greatest interest to us. 



