CYCLOPS. 113 



small and closely adpressed to the abdomen. Length 

 - 2 - 5 -th of an inch (1 mm.) 



The 11-jointed antennae and the structure of the 

 fifth foot, which consists of a distinct 1 -jointed 

 appendage, sufficiently separate this species from 

 C. phaleratus. It seems, however, to be of rare 

 occurrence, Professor Sars having noticed it but 

 twice, in the neighbourhood of Christiania, while I 

 have myself seen only a few specimens in a gathering 

 taken by Mr. David Robertson in a canal at Peter- 

 head, and one or two, which are doubtfully referable 

 to C. affinis, and were taken in the river at Pwllheli, 

 Carnarvonshire. A male of these Welsh specimens 

 is figured in Plate XXIV B, figs. 1015. 



(B. Anterior antennce 10-jointed.) 



10. OroLOPsKAUFMANKi,l7Z/awwi. PL XXIV, figs. 6 12. 



Cyclops Kaufmanni. Uljanin. Reise in Turkestan (Crustacea), 

 p. 38, t. xii, figs. 24 (1875). 



Abdomen not distinctly separated from the cephalo- 

 thorax. Third, fourth, and fifth thoracic segments, 

 and all the abdominal segments minutely dentated 

 along their posterior margins. Anterior antennae 

 (fig. 7) 10-jointed; third, fourth, fifth, and eighth 

 joints small ; the rest of moderate length ; those at 

 the base considerably stouter; the whole antenna 



