76 COPEPOnA OITHONA, ONC^A 



of distribution is eastern, from the Cape of Good Hope to the Azores, 

 whence it extends towards the English Channel and New York, 

 between 40° and 50° N. It is abundant in this area in the spring, 

 becomes scarcer there during the summer, but reappears in the 

 autumn (November). From 50° it advances far to the north, goes 

 round Spitzbergen, along E. Greenland, at least to 73° N., and in 

 Baffin's Bay at least to 75°. It is thus one of the most enduring of 

 all the organisms which constitute the Styli-plankton. — S. 



ONCiEA CONIFERA Giesbr. 



1898 March: Azores, very rare. 



1899 June: 62° N. 1° E. to 67° N. 3° W., deep sea hauls from 400 



to 550 metres, in strata 50 metres below the surface, more 

 or less rare. 

 September: 71° N. 21° W., haul from 225 metres, rare. 



Temperature: O.7, mean of 8 obs., max. 2.?, min. — l.e; at 

 the Azores 15.5. 



Salinity: 34.98, mean of 7 obs., max. 35.o5, min. 34.7i, (at the 

 Azores 35.95). 



Plankton-type. Noted from the tropical Pacific, the Medi- 

 terranean and the Karajakfjord on W. Greenland. Nansen collected 

 it rather plentifully north of the New Siberian Islands, 78° N. 136° 

 E. (hauls from 50 metres). G. 0. Sars mentions it from the S. coast 

 of Norway. I noted it from the Red Sea and Indian Ocean. The 

 occurrence in the Atlantic seems to prove that it belongs to the 

 Tricho-plankton, although it occurs in the Mediterranean. It is very 

 remarkable that it has never been seen in the Northern Atlantic 

 at the surface. It enters the Atlantic probably from the Polar 

 Basin, ultimately from the Pacific. — T? 



ONCiEA MEDITERRANEA (Claus). ^ 



1898 November: 42° N. 64° W. 

 December: 40° N. 22° W. 



1899 March: 33° N. 32° W. 



' This species is probably not rare in the tropical Atlantic, but of all 

 my notes, I will publish the above only, as I am afraid I have in other cases 

 confounded this species with 0. nenusta. 



