192 BRITISH PARASITIC COPEPODA. 



It has also an ovate or pyriform outline, narrow in 

 front. Genital segment elongated, narrow, and only 

 slightly enlarged towards the posterior end. 



Antennules short and composed of two joints, a 

 stout basal joint and a narrow end one which is 

 furnished with a few apical spines, a small bristle also 

 springing from near the end of the basal joint. 

 Antennae, like those of Charopinus dubius, short and 

 stoat, the outer ramus consisting of a small joint 

 articulated to the inner ramus and provided with two 

 short unequal spines ; the inner ramus stout with a 

 gibbous rounded end, both rami covered with micro- 

 scopic prickles. Mandibles narrow, oblong, the apex 

 obliquely truncate and coarsely serrated; maxilla3 

 small, moderately stout, biarticulate, and furnished 

 with three apical and subapical spines and a small 

 setiferous process. First maxillipeds three-jointed ; 

 second joint with a small setiferous knob near the 

 proximal end of the inner margin; end joint slender, 

 and armed at the apex with two minute spines and a 

 small slightly-curved claw. Second maxillipeds slender 

 and about as long as the body, exclusive of the posterior 

 appendages, becoming considerably altered at the distal 

 end where their inner surfaces are closely adherent, and 

 extending on each side into biramose processes which 

 penetrate the tissues of the host and form a secure 

 anchorage for the parasite. The genital segment 

 furnished with two posterior appendages moderately 

 short and slightly divaricate. 



Male. We have not ourselves noticed the male of 

 this species, but Kroyer describes and figures it in the 

 work quoted above.* It is, though smaller, very like the 

 male of Charopinus dalmanni, and is characterized by a 

 similar stout proboscis in front of the head and by 

 powerful maxillipeds fitted for grasping. 



Habitat. Parasitic on the gills and gill-arches of 

 Eaia clavata and Eaia maculata. Fish-Market, Aber- 



* " Bidrasr til Kundskab om Synltekrebsene/' ' Natur. Tidssk./ 3 Raekke, 

 2 Bind, p. 287. 



