78 



46. Platyeyelops phaleratus, (Koch). 



(PI. XLVIII) 



Cyclops phaleratus, Koch, 1. c., Heft 21, Tab. 9. 

 Syn: Cyclops canthocarpoides, Fischer. 

 lascivus, Poggenpol. 



Specific Characters. Female. Body rather short and stout, with the 

 anterior division pronouncedly applanated and broadly oval in outline, greatest 

 width about equalling '-'/3 of the length and occurring in the middle. Cephalic 

 segment of moderate size, about the length of the 4 succeeding segments com- 

 bined, and evenly rounded in front. Last trunk-segment comparatively broad, 

 with the lateral parts slightly produced and minutely hairy. Tail unusually 

 robust, somewhat exceeding half the length of the anterior division, and having 

 the posterior edge of all the segments coarsely denticulated ventrally and later- 

 ally; genital segment scarcely as long as the 2 succeeding segments combined, 

 and of nearly equal width throughout; last segment very short. Caudal rami short 

 and thick, about equalling in length the penultimate segment, and scarcely diver- 

 gent, distal part a little contracted and obliquely truncated at the end, upper 

 face crossed by 3 obliquely curved rows of very delicate spikes, outer edge 

 clothed in the middle with a few small spinules, seta of this edge very small 

 and not far from the end. issuing somewhat dorsally; middle apical setae very 

 strong and clothed for the greater part of their extent with small appressed 

 spinules, the inner one more than twice as long as the outer; seta of inner 

 corner small, scarcely longer than the spine of the outer. Anterior antennae 

 much shorter than the cephalic segment and only slightly dilated in their proximal 

 part, being composed of 10 joints clothed with comparatively short simple seta?; 

 1st and 6th joints the largest. Posterior antennae very strongly built, with the 

 first 2 joints imperfectly defined, 3rd joint densely hairy in front and on the 

 upper face, its seta very short, spiniform; terminal joint much shorter than the 

 penultimate one, apical setae of both joints very coarse and curved. Mandibles 

 and maxillae of usual structure. Anterior maxillipeds very short and stout, with 

 the basal part much dilated. Posterior maxillipeds likewise unusually stout, 

 with the first 2 joints imperfectly defined, the 2nd exhibiting outside a ledge 

 densely clothed with spinules, last joint very small and conically produced inside, 

 carrying 2 short, thick, hairy setae and outside them 2 thin bristles. Nata- 

 tory legs distinguished by their exceedingly broad basal part and the coarsely 

 spinulose rami; 2nd basal joint in 1st pair only slightly produced at the inner 

 corner, but having the deflexed spine of quite an unusual size; terminal joint of 

 outer ramus in 1st 3rd pairs with 3 coarse spines outside, in 4th pair with 



