JAPANESE FRESHWATER CYCLO PI D/E. 



IOI 



swimming feet with their 3-jointed branches, the terminal joint of 

 which is provided with appendages in the form of spines and setae, 

 the number of these appendages being as follows : 



ist pair of 2nd pair of 3rd pair of 4th pair of 

 swim. feet. swim. feet. swim. feet. swim. feet. 



Exopod 6 7 7 7 



Endopod 6665 



Fifth foot peculiar : small, 2-jointed, the larger distal joint 

 articulating with the inner aspect of the proximal joint instead 

 of with the distal end of same ; the appendages represented by 3 

 setae ; the longest seta on the outer edge of distal joint pinnate ; 

 the shortest seta on the inner edge of same lanceolate ; and the 

 3rd seta of medium length situated on the outer produced edge of 

 the distal end of proximal joint. First abdominal segment by far 

 longer than the three following taken together. Furcal rami about 

 6 times as long as broad, only slightly divergent, without hair on 

 their inner margin. Each furcal ramus with 4 apical setae : the 

 outermost the shortest ; the innermost a little longer than the outermost ; 

 the outer of the middle two much longer than the innermost ; and the 

 inner of same the longest of all, being longer than the entire length 

 of abdomen. Fifth setae very short ; lateral seta still shorter and 

 situated a little below the level of the distal fourth of furca. 



The form, to which the present species seems to be nearest, is 

 C. strenuns ; but the two species differ very considerably in the 

 following respects. In the first place, the first antenna in the new 

 species is decidedly shorter than in C. stremms in relation to the fact 

 that it is made up of 12-joints insted of 17. Secondly, the furca in 

 the present species is but slightly divergent and quite smooth on their 

 inner margin, whereas in C. stremms they are strongly divergent and 

 thickly beset with hair. Thirdly, the fifth foot of the new species is 

 peculiar in that the distal of its two component joints is long and 

 slender, obviously differing in this respect from C. stremms, in which 



