246 HISTORY OF BRITISH CRUSTACEA. 



Gen. 125. CYMODOCEA, Leach. 



Eyes reaching the front margin of the first segment. 

 Body seven-jointed ; not capable of being completely rolled 

 into a ball. Tail on each side at the base furnished with 

 two slightly-compressed appendages, outer largest ; tip 

 notched. Eront of head swollen, and not produced above 

 the base of the antennas. 



Cymodocea truncata, Leach. — Body slightly granulated, 

 its terminal appendage entire and truncated at the end; 

 third and fourth joints of abdomen with two dorsal tuber- 

 cles, the hind ones the largest. 



Coast of Devonshire (Montagu) ; dredged in Lamlash 

 Bay, in the Isle of Arran, by the Rev. Alfred Norman, and 

 found by the same gentleman under rocks, low-water, at 

 Herm. Belfast Bay (Thompson). 



Cymodocea emarginata, Leach. (Plate XIII. fig. 7.) 

 — Abdomen with its terminal segment notched at the end ; 

 third and fourth joints each furnished with two tubercles, 

 of which the latter is the largest. 



Mount Edgecumbe, near Plymouth, and Ealmouth. 



Cymodocea Montaguj, Leach. — Body somewhat linear ; 

 sixth segment of thorax with a prolongation, which is flat- 

 tened above. 



