GAMMARUS EDWARDSII. 387 



those of the first pair ; tlie pahii is straight and defined 

 by a slightly-produced point. The posterior pair of 

 caudal appendages are short ; the branches, which are 

 equal in length and subfoliaceous, are not longer than the 

 peduncle. 



Two specimens of this species were found by us in a 

 pool at Starcross, Devonshire, into which the tide for- 

 merly flowed, but which has been cut off" by the railway 

 embankment, so that we are not aware that the sea has 

 entered it for many years, while a small fresh-water 

 stream constantly runs into it. 



The animal was considered by us to be identical with 

 M. Edwards's description of G. marinus, and it was 

 named accordingly, until we discovered that Leach's 

 type-sjDccimens and description did not agree with those 

 of Edwards. We therefore abandoned the name belongf- 

 ing to another species ; but being desirous of associating 

 with the discovery one who has done so much for 

 Carcinology, we have attached to the species the name of 

 Prof. Milne Edwards. 



The colour of the specimens which we procured was 

 of a ferruginous red — a circumstance that in some measure 

 may be due to the soil, the whole of which is very red, 

 belonging, as it does, to the New Red Sandstone. We 

 presume from their general aspect that they are females, 

 and that the males will be of a slenderer form, with 

 longer limbs. 



The specimen which M. Milne Edwards originally de- 

 scribed, and which he considered might probably be 

 only a variety of G. locusta, was taken on the coast of 

 France. 



c c 



