KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 395 



S-shaped, and strongly serrated. The median lobe is very short and thin, with two minute 

 hairs at the apex. 



The perceon is longer than the pleon; the seventh segment is scarcely as long as 

 the two preceding together. 



The first pair of perceopoda are like that pair in the female, but somewhat more 

 robust. The femur is about eight times as long as broad. 



The second pair (PI. XVI, fig. 64) reach nearly to the middle of the tibia in the 

 third pair. 



The third pair (PI. XVI, fig. 65) are longer than the head, the pera?on, and the 

 first pleonal segment together. The metacarpus is longer than the femur. 



The fourth pair are much shorter than the third, but still quite as long as the head 

 and the first six pergonal segments together. 



The fifth pair are only a little longer than the fourth, and reach a little beyond 

 the apex of the- carpus in the third pair. The carpus is more robust than in the female, 

 and more strongly serrated; it is a little more than three times as long as broad. 



The sixth and seventh pairs are like those pairs in the female, but the femur is 

 somewhat more dilated, with convex margins. 



The pleon is considerably more robust than in the female. The first segment is a 

 trifle longer than the last pergonal. 



The pleopoda (PI. XVI, fig. 66) have the peduncle thicker than in the female. The 

 coupling spines have a hook-like tooth on either side below the head. 



The uropoda (PI. XVI, fig. 67). The first and third pairs are like those in the 

 female, but have the peduncle comparatively shorter. The second pair are short and 

 slender, and reach to the apex of the peduncle in the first pair; the outer ramus is two 

 thirds as long as the peduncle; the inner ramus is not developed. 



