298 HISTORY OF BRITISH CRUSTACEA. 



Gen. 161. CANTHOCAMPTUS, Westw. 



Foot-jaws small,, simple ; antennules simple ; ovary single. 



Canthocamptus minutus, Miiller, sp. — Thorax and abdo- 

 men not distinctly separated from each other, composed of 

 ten segments, gradually diminishing in size as they descend. 

 The animal frequently turns up the posterior part of the 

 body over the other, like the species of StaphjliniclcB. 



Hab. Ponds and ditches of fresh-water. 



Canthocamptus Stromii, Baird. — Thorax and abdomen 

 of ten segments, gradually tapering to the end; antennas of 

 eight short joints. 



Hab. Sea-shore at Cockburnspath, and at Dover. 



Canthocamptus purcatus, Baird. — Thorax and abdo- 

 men very distinctly separated, composed of ten segments, 

 the first the largest, the last ending in two short lobes, 

 from which proceed four setae, two much longer than the 

 others. 



Hab. Sea-coast, Berwickshire; Kent; Dorset. 



Canthocamptus minuticornis, Miiller, sp. — Thorax of 

 four segments, each terminating at the back in a sharp 

 spine ; abdomen of five segments, last one bilobed, with a 

 stout seta half the length of animal. 



