28 Distrib:itio7i of the Smaller Crustacea. [Sess. 



several adult males aud females, the majority were immature. 

 I do not know of a single record of this species from the east 

 or south-east coast of England, but Dr Wolfenden has taken it, 

 along with other southern forms, in the Faroe Channel. Its 

 occasional occurrence in the Moray Firth may therefore be 

 owing to the action of currents passing round the north of 

 Scotland into the North Sea. I have lately met with what 

 looks like a southward extension of the distribution of the 

 species on the east of Scotland, several specimens having been 

 obtained in a tow-net gathering of Crustacea collected off 

 Aberdeen on November 11, 1901. This is the first time I 

 have met with Euccdanus crassus so far south on the East 

 Coast. Euccdanus clongatus (Dana) has also occasionally made 

 its appearance in the Moray Firth, as well as another nearly 

 allied form — Rhincalamis nasutus, Giesbrecht, — a form which 

 I am inclined to regard as identical with Prof. G. H. Brady's 

 Rhinccdanus gigas. These probably, like the others, owe 

 their presence in the Moray Firth to the action of oceanic 

 currents. 



In a paper in Part III. of the Eighteenth Annual lleport 

 of the Fishery Board for Scotland, I record Corycceus anglicus 

 for apparently the first time in the Firth of Clyde. The 

 specimens had been obtained in a surface tow-net gathering 

 collected on May 29, 1899, in the vicinity of Ailsa Craig. 

 At about the time these specimens were obtained near Ailsa 

 Craig, Mr I. C. Thompson had been getting the same species 

 in abundance off Port Erin, Isle of Man. It is therefore 

 probable that these Clyde specimens were stragglers from the 

 same swarm that Mr Tliompson had met in with, and that this 

 swarm had entered the Irish Sea by the North Channel. I 

 had once before observed Corycceus anglicus in Scottish waters 

 — viz., in the Firth of Forth in 1896; and it has more recently 

 been captured, but very sparingly, between Lerwick and 

 Sumburgh Head, Shetland, in the Moray Firth, and off 

 Aberdeen. 



But besides the occasional introduction of southern species 

 within our faunal limits by oceanic currents, other forms 

 whose natural habitat is arctic or sub-arctic make their 

 appearance at intervals, and sometimes in abundance. These 

 are usually found early in the year, and are probably brought 



