104 MR. R. GUB,]SrEY ON LEANDER LONGIROSTRIS 



L. squilla from many localities, has come to the conclusion that 

 three varieties or geographical races should be separated :— 



(1) L. squilla, typical form. 



Scandinavia and the Baltic Sea. 



(2) L. squilla var. intermedia De Man. 



Holland, British, and probably French coasts. 



(3) L. squilla var. elegans Rathke. 



Mediterranean, Black Sea, Azores, Madeira, Canaries, 

 Cape Verde Islands. 



These varieties are separated by very slight differences, the 

 most important and constant of which relate to the antennule — 

 thus : — 



(1) Fused part of short flagellum a little shorter or a little 



longer than the free part, rarely equal to it. 



Typical form. 



(2) Fused part distinctly shorter than free part. 



var. intermedia. 



(3) Fused part distinctly longer than free part. 



var. elegans. 



Norfolk specimens agree with the description of the variety 

 intermedia, but it is possible, as De Man suggests, that L. sqtoilla 

 from Scotland may prove to belong to the typical northern race. 

 I have not had the opportunity of examining specimens from the 

 east coast of Scotland, bat a male received from Millport on the 

 west undoubtedly belonged to the var. intermedia, since the free 

 part of the flagellum exceeded the fused part in the proportion 

 of 5: 4. 



Distribiotion in Britain. — L. squilla appears to be distributed 

 all round the coasts of England, Ireland, and Scotland, even as 

 far as the Shetlands. It is a littoral species living betws^en tide- 

 marks, and I have found it to be abundant all along the Norfolk 

 coast from Hunstanton to Cley. At Wells it can be caught in 

 quantities by working a hand-net along the wooden quay-heading 

 at high tide. The pools on the salt marshes at Wells are tenanted 

 for the most part by Palcemonetes varians, but some were found 

 in August to contain L. sqailla in addition. At Thornham 

 numbers were taken on the woodwork of a sluice, and I have 

 found that such sluices, where a pool of water remains even at 

 low tide, are favourite resorts for this species. In such situations 

 it is quite commonly associated with P. varians, and it runs far 

 up the East Coast estuaries, but it appears to be none the less 

 intolerant of fresh water, and to abandon a sluice when a large 

 quantity of fresh water is being discharged. It does not nor- 

 mally occur on Breydon or in any part of the rivers Yare, Bure, 

 or Waveney. A single small specimen was, however, taken in 



