236 





the 4 succeeding segments combined and rather deep, with a transversal depression 

 about in the middle dorsally; rostral projection rather broad and terminating in an 

 obtuse point. Urosome about as long as the anterior division, genital segment, 

 like the succeeding one, slightly expanded laterally; last segment quadrangular in 

 shape, anal opercle tipped with a somewhat erect spine. Caudal rami about as 

 long as the anal segment and slightly attenuated distally, without any spinules, 

 but with a slender seta about in the middle of the outer edge and another close 

 to the tip, the latter carrying a single very strong spiniform seta not jointed at 

 the base. Anterior antenna not nearly attaining the length of the cephalic seg- 

 ment and of a very coarse structure, consisting of only 4 articulations, the last 

 2 joints of the proximal part and all of the terminal part being fused together 

 into single joints. 1st and 2nd joints each produced behind to a claw-like pro- 

 jection, that of the 2nd joint being much the larger. Posterior antennae likewise 

 rather strongly built, with the 2 apical spines claw-like, outer ramus very small 

 and somewhat lamellar, carrying 4 comparatively short setae. Mandibular palp of 

 insignificant size and rather narrow, with 4 somewhat unequal seta? at the end. 

 Posterior maxillipeds of moderate size. 1st pair of legs with the outer ramus 

 only consisting of 2 joints, and scarcely more than half as long as the 1st joint 

 of the inner; the latter exceedingly powerful, with the apical claw strong and 

 slightly curved at the tip. Natatory legs exhibiting the structure characteristic of 

 the genus, proximal joint of inner ramus with a well-developed seta inside Last 

 pair of legs comparatively large, foliaceous, distal joint oblong oval in form, and 

 carrying 6 marginal setae along the outer edge and the tip. 2 of them being very 

 thin and hair-like ; inner expansion of proximal joint narrow linguiform and ex- 

 tending to about the middle of the distal joint, its surface exhibiting a peculiar 

 areolated structure, marginal setae 5 in number, one of them being far remote 

 from the others and attached in front of the middle of the inner edge. Ovisac 

 comparatively small and of rounded form. 



Male resembling the female in its general appearance, but easily recog- 

 nizable by the strongly hinged anterior antennae, the 4th joint of which is greatly 

 dilated and produced in front near the base to a hamiform process. Inner ramus 

 of 3rd pair of legs with a straight posteriorly pointing mucroniform process issuing 

 from the middle joint outside and extending far beyond the last joint. Last pair 

 of legs much smaller than in female, distal joint with only 4 spiniform setae; 

 inner expansion of proximal joint very slight, with 2 subequal setae. 



Colour in both sexes a dark brownish gray, with stjll darker, almost 

 black shadows more conspicuous on the genital segment. 



Length of adult female about 1 mm. 



