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. 
Aétidius 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 Hucalanus crassus, but at a some- 
what later hour of the day. The occurrence of Aétedius armatus in the 
Shetland-Farde Channel is, like that of Hucalanus crassus, of considerable 
interest as bearing on the distribution of the species. Aétidius 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. 
Rie Bey; inlat. 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.-11° 
N. MrI.C. Thompson records it from Malta, and in my report on ‘Some 
Entomostraca from the Gulf of Guinea, West Coast of Africa,’ there are 
afew 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 
Aétidius 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 Aétidius 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 
Scolocithria 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’ 7" 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-Farde Channel is therefore interest- 
ing from its bearing on the distribution of the species, both horizontally 
and bathymetrically. 
