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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 antennae. 
Cymodocea trttncata, 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 Palmouth. 
Cymodocea Montaguj, Leach. — Body somewhat linear ; 
sixth segment of thorax with a prolongation, which is flat- 
tened above. 
