30 BRITISH COPEPODA. 



[Genus Cylindropsyllus, nov. gen. 



Animal cylindrical, mucli elongated; head united 

 with the thorax and having a sharp rostrum ; abdomen 

 4-jointed, as wide as the thorax, and not distinctly 

 separated from it. Anterior antennae short, 5-jointed ; 

 posterior 2-jointed, destitute of a secondary branch. 

 Posterior (?) foot-jaw small, provided with an apical 

 curved spine and several marginal setae (rest of the 

 mouth-organs unknown). First four pairs of swim- 

 ming-feet having the outer branch 8-, the inner 2- 

 jointed; branches of the first pair very short and 

 nea.rly equal ; inner branch of the second, third, 

 and fourth pairs very short ; fifth pair rudimentary, 

 1-jointed, foliaceous. 



In the Table of Classification (vol. i, p. 31) this 

 genus is given as Gylindrosoma ; which name, however, 

 being already in use, is here altered to Cylindropsyllus. 

 Though given in the table amongst Harpacticidae, it 

 more probably belongs to the Poecilostoma. For the 

 present I content myself simply with a description of 

 the species, without attempting to assign it to any 

 recognised family. 



1. Cylindropsyllus LiEvis, 72 02;. sj:». PI. LXXXIV, figs. 



1—8. 



Animal of equal width throughout, the abdomen 

 being as wide as the cephalothorax and not separated 

 from it by any constriction; first body-segments as 





