150 HISTORY OF BRITISH CRUSTACEA. 



upwards in this way, it soon regains its liberty. They are 

 found on sandy banks, chiefly frequenting those where there 

 is a little seaweed. Mr. Bate adds that the larva quits the 

 pouch iu a form closely resembling that of the parent. He 

 has obtained the young of two British species, a Cuma and 

 Diasiylk. 



Diastylis Rathkii, Kroyer, sp. (Plate IX. fig. 3.) — 

 Alauna rosfrata, Goodsir. — When alive, of a beautiful 

 bright straw-colour, inclining to yellow. 



Hab. Firth of Forth (Goodsir) ; Moray Firth (Rev. G. 

 Gordon) ; Arrari, St. Ives (Barlee) ; Falmouth (Webster) ; 

 Plvmouth, 



Gen. 52. CUMA, Edwards. 



Carapace not produced into a beak in front. Four seg- 

 ments of thorax complete, and exposed behind the carapace. 

 Upper antennae single-jointed and scale-like, lower short. 

 Abdomen, sixth joint with double-branched stylets. Centre 

 rail-piece wanting. 



Cuma scorpioides, Montagu, sp. — When alive, of a fine 

 straw-colour, delicately tinged with pink, which is brighter 

 in certain lights ; shell rough with shallow fovere. 



