I02 



SEIJI KOKUBO : 



the same joint is thick and short with the distal end obliquely cut 

 off. Further, the articulating point of the distal joint with the proximal 

 is shifted very much farther inwards than in C. stremms, causing in 

 consequence the remarkable bending of the foot, which character I 

 have availed of in naming the species. Finally, all the three setae, 

 with which the fifth foot is provided, arc very much longer than in 

 C. stremms ; the inner seta of the distal joint being straightly 

 directed, while the corresponding seta in C. stremius is inwardly 

 directed making an obtuse angle with the axis of the joint. 



I have collected this new species in the vicinity of Sapporo in 

 May, 191 1. Reproduction occurs in spring. Each egg-sac contains 

 about 25 eggs. 



7. Cyclops soli n. sp. 

 Pl. II, figs. 24—26. 



Body obtusely rounded in front, brown in colour, the female 

 measuring 0.9 mm. in length. First antennae unusually thick and 

 short, about 4- as long as first body segment, composed of 8 short 

 segments, the first and fourth segments being the longest and all the 

 rest shorter. Mouth appendages small. The anterior 4 pairs of 

 swimming feet with their branches 3-jointed. Fifth foot very small, 

 i-jointed, and with two appendages at the extremity. The postero- 

 lateral border of last thoracic segment fringed with a row of spines 

 (fig* 2 5)- The posterior margin of third and fourth abdoninal 

 segments slightly serrated. Furcal rami long and cyrindrical, parallel 

 with and widely separated from each other, each bearing a transverse 

 row of several spines at the beginning of the distal fourth of its 

 length. Of the 4 apical setae the outer and inner are the shortest 

 and nearly equal in length ; the inner of the remaining two is the 

 longest and about as long as the entire length of abdomen, while the 

 outer is about } as long as the inner. 



The present species is very closely allied to C. fimbriatus, but 



