PSEUDOCYCLOPS. 81 



here given and that of M. Boeck ; these result 

 probably from the observations in each case being 

 confined to a single specimen, but judging from 

 drawings kindly sent to me by that author, not long 

 before his death, I have no doubt of the specific 

 identity of the British and Norwegian specimens. 



Genus 2. Pseudocyclops, Brady (1872). 



Bodv robust, head distinct from thorax : abdomen 

 much more slender than the thorax, and composed of 

 four segments in the male, of three in the female. 

 Right anterior antenna of the male imperfectly hinged, 

 swollen in the middle. Posterior antenna 2-branched, 

 the secondary branch large, 2-jointed, first joint much 

 expanded at the distal extremity, second joint small. 

 Mandibles well developed, broad and strongly toothed 

 at the extremity and having a large 2-branched palp. 

 Maxilla? provided with a large, many-lobed palp. 

 Upper foot-jaw robust, composed of three large basal, 

 and three or four small apical joints ; lower foot- jaw 

 4-jointed, bearing several long, setiferous marginal 

 processes. First four pairs of feet 2-branched, each 

 branch 3-jointed and adapted for swimming ; fifth pair 

 in the female composed of two 3-jointed branches, the 

 inner branch much reduced in size; fifth pair iu the 

 male 2-branched, very complex in structure, adapted 

 for clasping, and closely resembling the male copulative 

 organs of some Ostracoda. 



