92 BEITISH OOPEPODA. 



antennae shorter than the cephalic segment, which is 

 separated from the thorax. Second pair 4-jointed, the 

 third joint very short ; no secondary branch. Mouth- 

 organs (figs. 4 7) as in the Galanidce. First four pairs 

 of feet 2-branched, both branches 3-jointed ; fifth pair 

 cylindrical, 2 3-jointed, composed each of one branch 

 only, alike in both sexes. 



This differs from the following genus Tliorellia in 

 the structure of the mouth-organs, especially in having 

 a well-developed biramose mandibular palp, and in the 

 non-prehensile character of the second foot-jaw. 



1. CYCLOPINA LITTORALIS, Brady. PI. XV, figs. 1 9. 



Cyclops littoralis, Brady. Nat. Hist. Trans. Northumberland and 

 Durham, vol. iv, p. 429, pi. xvii, figs. 9 14 

 (1872). 



Anterior antennae of the female short, 22- (23- ?) 

 jointed (fig. 2), joints from the third to the ninth very 

 wide, being about three times as broad as long, the 

 remainder subequal and about as broad as long ; the 

 seventh from the apex is produced considerably at its 

 outer angle, and the whole limb is rather thickly set 

 with long hairs. Mandible (fig. 4) provided with several 

 strong, sharp teeth ; palp 2-branched, the larger branch 

 3-jointed, the smaller composed of one joint. First and 

 second joints of the fifth foot (fig. 8) short and broad, 

 third much smaller and bearing four small terminal setae, 

 one of which is much longer and one much shorter than 



