NORTH ATLANTIC SEA AND THE FAKOE CHANNEL. 137 



has described it from the Gulf of Guinea, and Sars states that it was 

 abundant in the Polar basin crossed by Nansen ; it is recorded by 

 Giesbrecht from the Pacific, near Bergen (Nordgaard), and " at some 

 distance north of the Shetland Isles " (Sars). I have never once found 

 it in the Faroe Channel. Considering its widely differing habitats, it is 

 not easy to see why it should be described by Sars {Crust. Nonvcuj, p. 

 53) as of " undoubtedly Arctic origin." An allied species, A. hrevicornis, 

 is recorded by Scott once from a locality east of the Shetland Isles. The 

 same Copepod occurred in the cold area in July, 1902, but differs from 

 Sars' description in the entire absence of amalliforus sensory processes, 

 whicli are replaced by strong brush processes on both maxillipedes. The 

 head is broad and entirely without crest, and in every other respect it 

 agrees with Sars' A, hrevicornis, but cannot be an Amallopliora. 



In considering the horizontal distribution of the Copepoda of this 

 region, the following occur with frequency, and may be said to be 

 indigenous to the Faroe Channel : — 



Calanus finmarchicus, Eacalanus elongatus and crassus, Khincalanus 

 nasutus, Paracalanus parvus, Pseudocalanus elongatus, yEtideus tenui- 

 rostris, Gaidius pungens and major, Gaetanus major, Eucha3ta norvegica, 

 barbata, and glacialis, Pseudtetideus armatus, Faroella multiserrata, 

 Metridia lucens and longa, Pleuromamraa robusta, Heterorhabdus 

 norvegicus, Ectinosoma atlantica, Acartia Clausii, Candace pectinata, 

 Oncea conifera, Oithona similis, Centropages typicus and hamatus, 

 Euchirella rostrata, Bryaxis hrevicornis, Scolecithrix minor and similis, 

 Bradyidius armatus. 



Others in the foregoing list, which occur only occasionally, are 

 visitors brought from the Norwegian Sea or from the Atlantic south 

 of the Wyville-Thompson ridge, such as Phaenna, Haloptilus, Chiridius 

 obtusifrons, Ctenocalanus, Augaptilus, Pleuromamma abdominalis, Luci- 

 cutia, Anomalocera, ^Egisthus. 



I have not been able to state any essential differences as to abundance 

 of these individual species during the years 1899-1903, though the 

 hydrographical conditions of the Channel have been widely different.* 

 Thus in 1900 the whole Channel was occupied by water coming from 

 the south, strong earlier in the season, but in July with little move- 

 ment, but indications of intrusion of northern water at a depth of 300 

 fathoms on the east side. In 1901 most of the Channel was occupied 

 by water from the south, with feeble southward movement in the depth. 

 In 1902, at all depths below 150 fathoms, the Channel was tilled with 

 unusually cold fresher water, tlie southward movement increasing both 



* See Mr. H. N. Dickson's report ("Hydrography of the Farue-Slietland Channel," 

 Gcorjraphiad Journal, April, 1903) upon the hydrogiaphical results of the author's cruises 

 in this regioD. 



