12 



AUGUST BRINKMANN. 



[REP. OF TIII1 "MICMAEL SARS" NORTH 



bution of the species according to the water layers in which 

 it is found. 



On the hydrographical charts given below 1 have 

 noted the places of capture, with number of specimens 

 in roman numerals at the side. Not a single one of the 



be obtained in such investigations, that N. mirabilis is a 

 distinctly stenohaline and stenothermic species of marked 

 bathypelagic character, its upper limit of vertical distri- 

 bution being determined by the water layers to which it 

 is confined. It will be seen from the charts that this 



Stat. 



77. 79. 80 



•IOOOj. 



-1500 



2000 



Hydrographical section, "Michael Sars" 1910". Newfoundland to Ireland. After Helland Hansen in Murray 

 and Hjort (18) pag, 115. 



In this figure and the section below the depths of 



82 specimens in the material was taken in water of more 

 than 6 ,J , and nearly all in layers of less that 35 %o salinity. 1 ) 



Stat. 



500 _ 



1000 



1500 



2000 



Hydrographical section, "Michael Sars" 1910. Newfoundland to Sargasso 

 Sea. After Helland Hansen in Murray and Hjort (18) pag. 298. 



Save for some unimportant differences, the charts 

 show, with as high a degree of accuracy as could possibly 



2 ) The hauls at Stations 53, 62 and 101 are not noted on the 

 hydrographical sections; according to information received from Prof. 

 Helland Hansen, who is dealing with the hydrographical material of 

 the expedition, the nature of the water layers at the mentioned stations 

 was such that the catches here likewise fall within the given limits 

 of temperature and salinity. 



the hauls is reconed as epuivalent to -li of the length of Wire out. 



becomes deeper at the eastern stations, where the isotherms 

 and isohalines are lowered by the water masses of the 

 Gulf Stream. The species is thus not found in the inter- 

 mediate and upper layers of the Gulf Stream, which again 

 serves to explain the fact of its never being encountered 

 in the Norwegian Sea. Hydrographical charts of the 

 connecting waters between the Atlantic and the Mediter- 

 ranean (e. g. Jespersen 11) show that the Atlantic waters 

 typical of the species do not penetrate into the Mediter- 

 ranean; here accordingly, the species has not been found. 

 On the other hand, the connection between these Atlantic 

 water layers and the equivalent strata in the Pacific serves 

 to explain the occurrence of the species in that sea. 



25 



1' 



Habitat: 



Verrill (1892): 

 "Albatross", St. '2036 (Lat. 38° 53' N; long. 69° 

 Bottom trawl 1735 fathoms, 1 spec. 

 St. 2076 (Lat. 41° 13' N; long. 66° 

 Bottom trawl 906 fathoms, 1 spec. 

 St. 2229 (Lat. 37° 39' N; long. 73" 

 Bottom trawl 1423 fathoms, 1 spec. 

 St. 2236 (Lat. 39" 11' N; long. 72" 

 Bottom trawl 636 fathoms, 

 St. 2428 (Lat. 42" 48"N; 

 Bottom trawl 826 fathoms, 

 St. 2724 (Lat. 36" 47' N; long. 73" 25' W) 



W) 

 W) 



17' W) 



1 spec, 

 ong. 50' 

 1 spec. 



09' W) 

 56' W) 



Bottom trawl 1641 fathoms, 1 spec. 



