4 8 



COPEPODA 



8/6 1905 St. 72 5752 Iv. N. 9 53 L. W. Yt 1500 M. Wire 50 f?; 5 f c?; 20 y? (V); 20 y( ? (V); i yc ? (IV). 



2 / 6 1905 St. 88 4809 L. N. 83O L. W. Yt. 300 M. Wire 75 f?; 60 f <?; 15 y? (V); 5 yd* (V). 



2I /e 1905 St. 90 4747 L. N. 8oo L. W. Yt 300 M. Wire 10 f ?; 10 f d 1 ; i y? (V); 2yd 1 (V). 



'7/ 7 1904 St. ii 95954 Iv. N. 4oo L. W. Yt 500 M. Wire i y? (V). 



From the material available it has been impossible to form any conclusive opinion about the 

 season at which Rhincalanus nasutus attains its full development. By counting the specimens, col- 

 lected by the Thor Expedition with the young fish trawl from May, June and July 1904 and 1905, I 

 have attained the following figures. Even if we admit that the animals have been taken in two suc- 

 ceeding years in a limited and occasional quantity, I think that the following figures give some im- 

 pression of the relation between the males and females etc. About 100 f $, 20 y$ and a few young 

 males were taken in the mouth of May 1904 between 6a47 L. N. i5O5 L,. W. and 6ii5 L. N. 935 

 L,. W. In June 1905 about 150 f ?, about 80 f d\ about 105 y $ and 50 yd 1 were taken between 5752 L,. N. 

 and 4747 L. N., 953 L. W. and 8o6 L,. W. In July 1904 (6i3o L,. N. I7o8 L. W.) a single sample 

 containing 150 f ?, i f J 1 , 2 y? and 2 yc? was taken. : / 9 1904 (6249 L. N. i846 L. W. Yt 500 M. W.) 

 5 females were captured. As the greatest number of males (60) against 75 females, of which three carried 

 spermatophores attached to the genital somite, were taken 20 / 6 1905 St. 88 48O9 L. N. 83O L,. W. Yt. 

 300 o, propagation probably took place in this locality. 



Distribution. This species has been recorded from the Pacific between the Straits of Magellan 

 and the Gulf of California, from the western part of the Mediterranean and from the Indian Ocean 

 (one specimen only). Our knowledge about its distribution in the greater part of the Atlantic is very 

 scarce: "As far as concerns its distribution in the N. E. Atlantic, it may be regarded as an inhabitant 

 of the Atlantic current; its distribution to the north and east depending on the varying strength of 

 that stream" (Far ran p. 65). I think, that its occurrence on the west coast of Ireland, the Faeroe 

 channel, the Faeroe-Iceland channel, the North Sea south and south-east of Shetland, the Norwegian 

 Sea east of the Faeroes and east of Iceland (Sars), as well as at my own localities the south and west 

 of Iceland is easily explained in this way. 



The vertical range of the species seems to be uniform from the surface down to more than 

 1800 meters (Far ran p. 66). 



Esterly (1912 pp. 317 318) has on a somewhat scanty material drawn the conclusion that 

 there is indication "of a movement of the greater proportion of the individuals from the neighbour- 

 hood of 200 fathoms upwards to above 100 fathoms at night". 



6. Eucalanus elongatus Dana. 

 (PI. I figs. 5 a d; text-figs. 9 a f). 



1852. Calanus elongatus n. sp., Dana. 



1877. Eucalanus elongatus Dana. Streets, p. 139. 



1892. Giesbrecht, pp. 131, 149. 



1894. spinifer n. sp. Scott, p. 29, pi. I, figs.is 23. 



1895. elongatus Dana. Giesbrecht, p. 248. 



1898. Giesbrecht & Schmeil, p. 20. 



1898. Eucalanus elongatus Dana. Aurivillius, p. 29. 

 1901. Cleve, p. 6. 



1903. J. C. Thompson, p. 15. 



1904. Wolf en den, p. 127. 



1904. Atlanticus u. sp. Wolfenden, pp. 113114, 



pi. IX, figs. 3-4. 



