114 



PROF. W. A. HERDMAN ON THE DISTRIBUTION 



In 1913 the numbers were lower, and the maximum was 4000 on 



July 28th. 



In 1914 the maximum was 7320 on August 6th. 



In 1915 again the numbers were low, the highest being 3232 on July 1st. 



In 1916 a swarm appeared in the bay on July 11th, when over 12,000 

 were taken in a haul. A few days before a similar haul gave only 10 

 specimens, and a few days after 200. The average per haul at Port Erin 

 over the ten years is only 266. 



On the whole this record agrees well with that at Plj r mouth, which is 

 " Common on and off from the end of April to the beginning of November, 

 generally present in small numbers at other times" (Miss Lebour). 



Fig. la. — Calanus Jinmarc/iicus, from a photo-micrograph by A. Scott. 



Calanus finmarcMcus (fig. 13), as its specific name suggests, is a northern 

 or Scandinavian form with a wide distribution through the colder waters of 

 the North Atlantic. According to Ove Paulsen its home and centre of dis- 

 tribution lies t© the south of Iceland. 



In Loch Fyne on the west coast of Scotland, off Skate Island, Calanus 

 appears to be present throughout the year in great quantities in deep water, 

 at or near the bottom, along with Euchceta norvegica and Nyctiphanes 

 nor'vegica. For example, in July 1907, off Skate Island in 104 fathoms, we 

 caught 13,000 Calanus in one vertical haul, and on another occasion off 

 East Loch Tarbert, in 76 fathoms, we got 10,000. We have also obtained 



