112 BRITISH COPEPODA. 



segments, and the character of their spinous armature. 

 I have not recognised it as British except in a gather- 

 ing taken in Crag Lake, Northumberland, in Sep- 

 tember, 1876, but it is quite possible that it may have 

 been overlooked in other cases. Professor Sars states 

 that it occurs commonly in the larger sheets of water 

 in Norway, but that he has not noticed it in small 

 ponds. 



(D. Anterior antennae \\-jmnied.} 



9. CYCLOPS AFFINIS, Sars. PI. XV, figs. 11 14; and 

 PI. XXIV B, figs. 1015. 



Cyclops affinis, Sars. Oversigt Ferskvandscopepoder, p. 47 (1863). 

 Uljanin. Roise in Turkestan (Crustacea), p. 36, 



t. xi, figs. 37 (1875). 



In general appearance like C. phaleratus. Anterior 

 antennae much shorter than the first body-segment, 

 moderately stout and composed of eleven segments, 

 the last three of which are of nearly equal length. 

 Fifth pair of feet 1-jointed, bearing three apical setae, 

 the innermost of which is ciliated and much larger than 

 the other two. The caudal rami are only slightly 

 longer (PI. XV, fig. 13) than those of C. phaleratus ; 

 of the two principal setas the inner is three times 

 longer than the outer, exceeding the whole length of 

 the abdomen, is finely aculeate, and at the same time 

 imperfectly jointed (fig. 14) in the middle, the termi- 

 nal portion being finely ciliated. The ovisacs are 



