GAMMARUS MARINUS. 373 



very gregarious, one or two may be seen entirely of a 

 buff colour. 



They live amongst the seaweed, and are commonly 

 found, when the tide is out, to abound far up in estuaries 

 and beneath such of the weed as is below high-water 

 mark, forming a band around the coast-line probably of 

 all southern and western Europe. 



Dr. Leach's specimens of this species in the British 

 Museum are from the coast of south Devon. We have 

 found it very abundantly at Plymouth. Dr. Walker has 

 found it rather common from the mouth of the Mersey 

 to the River Dee. The Rev. Mr. Norman and Mr. Jeffreys 

 have taken it in the Outer Skerries Harbour, Shetlands. 

 Mr. W. Thompson records it from the River Ban, 

 Kilrea, Strangford Lock, Ballysodare, co. Sligo, and 

 Loch Neagh, in Ireland. The specimen described and 

 figured by M. Milne Edwards, under the name of G. 

 Olivii, was found by him abundantly on the coast of 

 Naples ; and that which he described as G. affinis, having 

 the first pair of hands much larger than the second, he took 

 on the coast of La Manche. The specimen that Rathke 

 described under the name of G. gracilis he procured 

 abundantly at Cape Parthenon, in the Crimea ; whilst 

 G. Kroyeri and pcecilurus he obtained at Christiansund, 

 Molde, Drontheim, Namoen fiord, and Nitika ; and 

 Liljeborg has procured it on the eastern coast of Sweden. 

 We can discover no character sufficient to distinguish 

 these from Leach's specimens. 



The figure given by Rathke of G. poscilurus has the 

 palm of the hands drawn as serrated, which is not the 

 case in G. Kroyeri. This character is not noticed in the 

 author's description, and both Liljeborg and Bruzelius 

 consider the two to be one and the same species. 



