NORTH ATLANTIC PLANKTON. 



It was found in nearly all the tow-nettings, and although 

 considerable difference in size was noticed between various 

 individuals, they did not appear to be structurally different. 

 The largest specimens observed were in the material 

 collected while traversing the Labrador current. 



Calanus propinquus and C. tonsus were observed in a 

 few of the gatherings in mid-ocean, where they appeared 

 to take the place of C. finmarchicus. 



Paracalanus parvus was found in the tow-nettings 

 taken between Liverpool and the north coast of Ireland, 

 but nowhere else. 



Pseudocalanus elongatus, a very common species around 

 our shores, occurred in nearly all the tow-nettings, and 

 was even more numerous than Calanus finmarchicus. It 

 is evidently common in the North Atlantic, although it 

 has not hitherto been recorded from any locality outside 

 European seas. In the case of many of the species the 

 present collection has extended the known range of dis- 

 tribution. 



Eucalanus attenuatus was observed in one only of the 

 tow-nettings, taken near mid-ocean. 



Mticlius armatus occurred in the same collection as 

 Eucalanus ; it was also taken on the previous day. This 

 species, though widely distributed, was not known to 

 occur in the Atlantic north of the Mediterranean, until 

 quite recently. Mr. T. Scott records it from the Shetland- 

 Faroe Channel. Other records for this Copepod are : — 

 Indian Ocean, Torres Straits, off Port Jackson, and in the 

 Chinese Sea (Brady) ; off Gibraltar (Giesbrecht), Malta 

 (I. C. Thompson), Gulf of Guinea (T. Scott). 



Euchceta marina was found in the majority of the 

 collections taken between mid-ocean and Quebec. This is 

 another species which appears to have a wide distribution, 

 and more especially in tropical seas. 



