32 BRITISH COPEPODA. 



Family 7. COEYC^ID^;, Thorell. 



Body composed of eleven or twelve segments, 

 elongated or subpyriform ; abdomen elongated, much 

 narrower than the cephalothorax ; head usually anchy- 

 losed with the first thoracic segment. Anterior 

 antennae alike in both sexes, 5 7-jointed ; posterior 

 simple, 3- or 4-jointed, forming a prehensile hand, 

 which is armed at the apex with a claw. Mouth- 

 organs (except the second pair of foot-jaws) minute, 

 and destitute, or nearly so, of palps. Posterior foot- 

 jaw forming a prehensile organ, and, in the male, 

 powerfully clawed. First four pairs of feet alike or 

 nearly so, and adapted for swimming, 2-branched. 

 Fifth pair of feet rudimentary, alike in both sexes, 

 seldom altogether absent. Heart wanting. In addi- 

 tion to the small median eye, there are usually two 

 large lateral eyes, each composed of a single lens. 

 The sexual organs, in both male and female, are 

 double and symmetrical. Ovisacs usually two. 



The British genera belonging to this family are 

 Corycceus, and Monstrilla. 



Genus 1. CORYG^EUS, Dana (1845). 



(Dana, Proc. Acad. Nat. Sc. Pkiladelph.) 



Body elongated, subcylindrical; abdomen 2-jointed, 

 penultimate segment of the cephalothorax produced 

 ventrally into two hook-like processes (PL LXXXIV, 



