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HISTORY OF BRITISH CRUSTACEA. 
Gen. 83. AMATHIA, Bathke. 
Upper antenna with secondary appendage; telson entire ; 
animal shaped like Gammarus . 
Amathia cakinata, Rathke. Head with a small beak ; 
centre of the dorsal surface surmounted by a distinct keel, 
commencing at the head and terminating with the caudal 
segments. 
This species, described by Rathke as a native of the 
shores of the Crimea, has been recently sent to Mr. Spence 
Bate from Banff by Mr. Edwards. 
Gen. 84. GAMMARUS, Latr. 
Upper antennae slender, and furnished at the base of the 
fourth joint with a small jointed bristle. Tail above fur- 
nished with tufts of spines. 
First and second pairs of legs subcheliform, the others 
not prehensile ; six hind pairs of legs similar to each other. 
Telson double. 
Gammarus locusta. Common Coast Screw . — Of a horny 
colour; body smooth, glossy, compressed; eyes lunated. 
Length an inch. 
