GAMMARTJS. 183 



Common on all the coasts of Britain. Colonel Montagu 

 observes that this species is wholly marine, never quits the 

 water by choice, is incapable of leaping, and seems to have 

 very little use of its legs out of that element ; for when de- 

 prived of water it lies on its side, and endeavours to force 

 itself along by the action of its tail. If put into fresh 

 water, it soon dies. 



Gammarus carinatus.* — Body clouded with red and 

 horn-colour, and sometimes with white, and sprinkled with 

 minute yellow dots. Segments of the back strongly keeled, 

 hind margins with distant granules. 



Berwick, often taken in baskets used for catching crabs. 



Gammarus marinus. Leach's Coast Screw. — The process 

 between the antennae somewhat pointed. 



Hab. South coast of Devon. Strangford Lough (Thomp- 

 son) ; Ballysodare, Sligo (Mrs. Hancock) . 



Gammarus Camptolops. Bent-eyed Coast Screw. — Eyes 

 flexuous, shaped somewhat like the letter S. Pound in 

 the sea near Loch Eanza in the Isle of Arran (Dr. Leach) ; 

 River Lagan, Belfast (Messrs. Hyndman and Thompson). 



Gammarus maculatus. Spotted Coast Screw. — Body 

 smooth, glossy ; back dusky, with a faint yellow band 



* Dr. Johnston, Zool. Journ. iv. 52. 



