466 G. STEWARDSON BRADY. 



constricted. The lateral spines of the outer branches of the 

 swimming feet are perfectly smooth, without spinules or 

 denticles. 



The only available specimens of the male of this species 

 were imperfectly preserved. It approaches rather closely 

 to some of those described by Professor Sars from the 

 Tanganyika expedition, notably to D. simplex and D. 

 cunningtoni. 



Tlie specimens here referred to Avere taken by Dr. Warren 

 at Equeefa, Natal. 



Diaptomus masculus, sp. n. PI. XXXV, figs. 2-6. 



Female. — Body moderately stout. Seen dorsally, the 

 anterior division is of nearly equal width throughout; the 

 head somewhat narrowed and evenly rounded off; posterior 

 segment truncated, its lateral angles not much produced; 

 urosome four-jointed, the second joint much the longest ; 

 caudal lamina scarcely longer than broad, about equal in 

 length to each of the two preceding joints ; terminal set» 

 slender, not basally dilated, very feebly plumose; anterior 

 antennae reaching when reflexed to the middle of the urosome. 

 Basal joint of the last pair of legs simple ; inner branch 

 claviform, simple, uniarticulate, with two short apical hairs; 

 first joint of the outer branch rather exceeding the inner 

 branch in length; second joint produced distally into a slender 

 spine which is marginally pectinated beyond the middle ; to 

 its basal portion is attached a small spine with a papilliform 

 base, which may perhaps be considered as a rudimentary third 

 joint. The lateral spines of the swimming feet are minutely 

 spinulose. 



Length about 2"10 mm. ; of male 1-4 mm. Colour reddish- 

 brown. 



Male. — Body of the adult very slender, about two-thirds 

 as long as that of the female, narrowly rounded in front, 

 somewhat narrowed and subtruncate behind, rounded off 

 laterally; urosome slender, five-jointed; caudal laminee short, 



