NORTH ATLANTIC SEA AND THE FARiiE CHANNEL. 127 



southern waters are met with in which the shape of the liead and the 

 size of the animal, length of antennae, etc., are in no wise different 

 from the northern species. Tiie structure of tlic fifth feet of the 3 is 

 known to vary very considerably, as Giesbrecht long ago pointed out 

 for examples from Hong Kong. Even in Faroe examples (and those 

 from more southerly latitudes) this is also the case, and the fact is that 

 the species is very variable. Being also the most prolific Copepod 

 known, at any rate in northern waters, and constantly present in various 

 stages of development, is it not more natural to regard these variations 

 as only different stages of growth ? At any rate, the very careful 

 measurements and study which I have made of this Copepod between 

 the lat. 51°-62° N. convince me that the points stated by Sars are not 

 sufficiently reliable to justify such a differentiation of the species. 

 The horizontal distribution of this Copepod is known to be very wide. 

 In the Faroe Channel it is extraordinarily abundant, but south of the 

 Wyville-Thompson ridge it appears to get less frequent the further 

 south we go, and though taken throughout the Atlantic traverse, it 

 does not occur in great numbers at about lat. 51° (at any rate in 1903). 

 It is, however, known to reach the deep water under the Sargasso 

 Sea (Dahl). 



Eucalanus. In a former list (this Journal, January, 1902) I included 

 EiLC. attenuatus in the list of Copepoda found in the Faroe Channel. 

 It is true that I found it once in a sample from Station A 1 in the 

 Faroe Channel, but I am of opinion now that this sample had become 

 contaminated with some material from the Indian Ocean, and as I have 

 never found it in any other samples from the Faroe Channel, including 

 those collected by Fowler, which were afterwards referred to me, I must 

 conclude that it does not occur in the Faroe Channel. In a subsequent 

 paper by Dr. Fowler in Proc. Zool. Soc, February 3rd, 1903, it is spoken 

 of as forming 22 per cent, of the Epiplankton and 41 per cent, of the 

 Mesoplankton of this region. This, however, is an error, and it should 

 be eliminated from the list. The species referred to is undoubtedly 

 F. elongatns. This species is very abundant in the Faroe Channel, 

 not uncommon in the fiords of Shetland, and occurs throughout the 

 Atlantic stations as far south as 51°, but less abundantly than in 

 the Faroe Channel, where it is apparently indifferent to temperature, 

 occurring at all depths. It is, however, curious that it does not extend 

 further north to the Norwegian Sea, and is not mentioned by Sars 

 as having been seen off the Norwegian coast. Its northern limitation 

 appears to be very well defined. 



Hue. crassus is frequently met with in tlie Faroe Channel, and has 

 occurred in great alnmdance in some hauls with the " midwater open 

 net" at 45 to 50 fathoms. It is also met with througliout the Atlantic 



