of the Fishery Board for Scotland. 313 



known as to its distribution : — Heligoland (Claus), North Sea (Mobins), 

 Trieste (Claus ; Car.), Teneriffe (I. C. Thompson), West Coast of South 

 America, Hongkong (Giesbrecht), Plymouth (Bourne), Irish Sea (I. C. 

 Thompson), Firth of Forth (Mihi). 



Pseudocalanus elongatus, Boeck. — This Copepod is usually more or 

 less common all round the British coasts. According to Dr Giesbrecht, 

 the known distribution of this species extends approximately from lat. 

 50° to 60° N., and from the Baltic to about long. 10° W. 



Aetidius armatus, Brady. — Several specimens (all female) of this 

 species were obtained on the same date and also at the same station 

 (' Knight-Errant Station No. 33 ') as Eucalanus crassus, but at a some- 

 what later hour of the day. The occurrence of Aetidius armatus in the 

 Shetland-Faroe Channel is, like that of Eucalanus crassus, of considerable 

 interest as bearing on the distribution of the species. Aetidius armatus 

 was first described by Prof. G. S. Brady in his work on the ' Challenger ' 

 Copepoda, where he records its occurrence in gatherings from the follow- 

 ing places : — Indian Ocean (lat. 46° 46' S., long. 45° 31' E.), Torres 

 Straits, off Port Jackson, Australia ; Chinese Sea (lat. 17° 54' N., long. 

 1-7° 14' E.) ; in lat. 32° 24' S., long. 13° 5' W. ; and in lat. 3° 10' N., 

 long. 14° 51' W. Dr Giesbrecht, in his work on the Copepoda of the 

 Gulf of Naples, records it as follows :— Gibraltar, 99°-124° W., 3° S.-ll° 

 N. Mr I. C. Thompson records it from Malta, and in my report on ' Some 

 Entomostraca from the Gulf of Guinea, West Coast of Africa,' there are 

 a few records of the species for that district. It may also be stated 

 that the specimens recorded by Dr Giesbrecht were obtained at a depth 

 of 2300 metres ; those from the Gulf of Guinea were obtained at depths 

 varying from 5 to 460 fathoms (fully 1400 metres), The capture of 

 Aetidius armatus at this northern station is therefore of interest, as it 

 extends greatly the limits of its distribution, and indicates that its 

 distribution is almost world-wide. The presence of the Aetidius armatus 

 at this ' Knight-Errant ' station might of course be due to the action of 

 oceanic currents transporting the specimen beyond the normal limits of 

 the distribution of the species. 



Scolocithrix abyssalis, Giesbrecht. — The occurrence of this species in 

 the 'Research' collection is of interest. In my report on some Entomos- 

 traca from the Gulf of Guinea (pub. 1894), a Copepod is described as 

 Scolocithrix tumida, which appears to be identical with Scolocithrix 

 abyssalis, Giesbrecht. The ( Research ' specimen agrees perfectly with the 

 form described as S. tumida. The specimens from the North Pacific 

 and the Gulf of Guinea were obtained in moderately deep water, the 

 former from 1000 to 4000 metres, the latter from 85 to 460 fathoms; but 

 the ' Research ' specimen is from a surface gathering. The known dis- 

 tribution of this Scolocithrix appears to be very limited ; the only 



record given by Dr Giesbrecht, and referred to above, is as follows • 



< 124°-132° W., 11°-14° N. ; in 1000-4000 metres, Tiefe,' and it was 

 obtained at only two stations in the Gulf of Guinea, viz. : at about 100 

 miles to the west of Lonago (lat. 4° 27' V S., long. 10° 1' 8" E.), in 85 

 and 235 fathoms ; and at about the same distance west of Princes Island 

 (1° 55' 5" N., 5° 55' 5" E.), in 460 fathoms. Its occurrence at the 

 surface of the water at the Shetland-Faroe Channel is therefore interest- 

 ing from its bearing on the distribution of the species, both horizontally 

 and bathymetrically. 



