184 HISTORY OF BRITISH CRUSTACEA. 



across each segment, and a row of yellow spots along each 

 side. Eyes oblong, red, running backwards. 



Sea-coast near Berwick ; rare. 



Gammarus fluviatilis. Fresh-water Screw. — Eyes 

 ovate; three last joints of body smooth; lower pair of 

 caudal fins rather the longest ; legs rough. 



Pound in fresh-water ; cannot leap, and dies very soon 

 when taken out of water. 



Gammarus gracilis, Eathke. — Upper antenna much 

 longer than the lower. Last pair of hind false feet with 

 the stylets unequal. 



Plymouth (Mr. Bate). 



Gammarus palmatus, Montagu. — Pirst jaw-foot with a 

 very small hand ; second, with hand very large and square ; 

 last joint scimitar-shaped. 



Devonshire (Montagu); Plymouth (Mr. Spence Bate). 



Gammarus Othonis, Edwards. — Hands subequal, long 

 and narrow towards the extremity. The last of the false 

 feet with the stylets equal. 



Plymouth (Mr. Spence Bate). 



Gammarus longimanus, Leach. — Second hand much 

 larger than the first, very long, and not narrowing towards 

 the extremity ; last caudal stylets equal. 



