1:*0 NOTES ox THE COPEPODA OF THE 



ably reach the Mediterranean, from which point southwards the 

 southern variety extends. The species described by Scott as P. jxirvits 

 from the Gulf of Guinea must, T think, be designated P. acukatus (Gbt.). 



Calornlanus jx^^^'o. The occurrence of this species north of 50° IST. is 

 unusual, its previous limitation being 30° N. Two undoubted examples 

 occurred in hauls made west of Valentia, but in this case it was probably 

 an accidental wandering beyond its proper limitations. 



Gtenocalanus vanus and Calanus tenuicornis must probably be regarded 

 as having wandered far out of their usual habitat when found, the former 

 in the Faroe Channel, the latter off the west coast of Ireland. The 

 former is recorded, however, by Giesbrecht as rather common in the 

 Antarctic Ocean ( Voy. du Belgica). 



Hctcrorhahdus. The species which I had previously named H. Clnusii 

 (this Journal, January, 1902) should be //. norvegicus. Until the 

 publication of Sars' recent work {Crust, of Noncay) no full account, 

 and no figures of the original species of Boeck were available. I am 

 now convinced that the Faroe examples are really Boeck's species, 

 H. norveyicus, which extends southwards at any rate to 52" N. 



The H. zetesios recorded in that list I now think to be the male of 

 H. lonyicornis, previously unknown, and I have taken it on many 

 occasions since that date, both in the Faroe Channel and the Atlantic. 



H. norvegicus is distinctly a boreal species, while H. Jongicornis (vel 

 zetesios) belongs just as certainly to the warm area, occurring with 

 considerable frequency in the warm Atlantic area. The <? is of such 

 frequent occurrence in this region that it is curious that it should have 

 been overlooked in previous records. H. vipera and H. abyssalis 

 occurred only in the warm area, and have never been seen north 

 of the Wyville-Thompson ridge. II. grandis is certainly only a very 

 deep water species. 



The Hctcrorliahidm are species which seek deep water and do not 

 approach the coasts, at any rate in the North Atlantic. H. norvegicus 

 is capable of existence within a very extreme range of temperature, 

 from the polar water of the Faroe Channel to the warm Atlantic. 

 II. longicornis can apparently endure greater extremes than II. vipera, 

 but is not so robust as the first-named species. Amongst Epiplank- 

 ton I have found only quite young and undeveloped examples of 

 Heterorhahdus. 



Candace. What is meant by Candace truncata in Fowler's list {P.Z.S., 

 June, 1898) it is impossible to say. It is a Pacific Ocean species. 

 Probably Thompson meant C. norvcgica (Boeck), which has received 

 a full description from Sars (in Crustacea of Norway) and extends 

 southwards, at any rate as far as 51° N., where I took it at a depth 

 of 300 fathoms. 



