JATANESE FRESHWATER CYCL01TD.E. 



IO3 



differs from it in many points, among which the following two seem 

 to be the most noteworthy. In the first place, this species is 

 characterized by the presence of only 2 spines on the fifth foot 

 (fig. 25), while C. fimbriates should possess 3 of them as is obvious 

 from the figure given by Brady in his work (1) (fig. 25, pi. 23). In the 

 next place, the present species is in constant possession of a transverse 

 row of spines on furcal ramus, which seems to be absent in Brady's 

 species, since this author neither mentions nor figures anything an- 

 swering to it. 



The species is appearently an inhabitant of the muddy bottom 

 of lakes and marshes. My specimens were captured in the vicinity 

 of Sapporo, and it is of interest in fishcultural respect that the 

 animals are often found in the stomach of the carp. The breeding 

 season is not yet exactly known. I have found each egg-sac to 

 contain about 12 eggs. 



8. Cyclops phaleratus japoiiicus n. subsp. 



Pl. II, figs. 27- — 29. 

 Body appears to be rather short on account of the wide abdomen. 

 It gradually narrows backwards, just as in Canthocamptus. The 

 first antenna is short, not exceeding the first body segment in length. 

 Body brown in colour, eyes red, the second thoracic segment 

 practically colourless. All the 4 pairs of swimming feet are rather 

 short ; the i-jointed fifth foot is likewise very short. On the hind 

 edge of abdominal segment there is on each side a strong spine 

 about equal to that segment in length. Mouth appendages small 

 and closely put together. Each ramus of furca is short and bears 

 three apical setae, of which the innermost is the longest, the 

 outermost the shortest, and the middle about half as long as the 

 former. Both the innermost and middle setae are not haired, but 



(1) Brady, G. S., A monograph of the free and semi-parasitic Copepoda of the British 

 Island, vol. I, p. 1 1 6 (London). 



