KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 235 



a bristle; the hind margin is straight, and serrated as in the first pair. The dactylus 

 is more than half as long as the metacarpus, with the hind margin smooth. 



The third and fourth pairs. The femur is bent at the base, and much broader 

 at the apex than at the base. The tibia is much longer than the genu, broader 

 below, and provided with one bristle on the front margin and one on the hind. The 

 carpus is longer than the tibia, and is tolerably broad; the hind margin is straight, 

 finely serrated, and armed with a bristle at the lower corner. The metacarpus is about 

 as long as the two preceding joints together; the hind margin is finely serrated. The 

 dactylus is feebly curved, and somewhat more than half as long as the metacarpus. 



The fifth, sixth, and seventh pairs are about as long as the two preceding pairs. 

 The femur is less dilated than in the preceding species, and fully twice as long as it is 

 broad at the apex. The tibia is fully twice as long as the genu. The carpus is about 

 as long as the .tibia; the front margin is smooth. The metacarpus is much longer than 

 the carpus, but considerably shorter than the tibia and carpus together, The dactylus 

 is not fully a third part as long as the metacarpus. 



The pleon is as long as the pereeon. The segments are dorsally produced in the 

 median line into sharp-pointed, narrow, spine-like, processes, directed backwards. The hind 

 corner of the lateral parts are angular, and sharp-pointed. 



The pleopoda. The outer ramus of the first pair has six joints, the inner five. 



The urus is longer than the last pleonal segment. The first segment shows dor- 

 sally a median, sharp-pointed process, like those mentioned from the pleonal segments; the 

 first segment is nearly twice as long as the last coalesced, which is a third part broader 

 than long. 



The uropoda (PI. XI, fig. 41). The first pair reach beyond the middle of the outer 

 ramus of the last pair; the peduncle is linear, four times as long as broad, and much 

 longer than the inner ramus; the rami are elongated, sharp-pointed, and entirely smooth; 

 the outer ramus is a trifle shorter than the inner. The second pair reach a little beyond 

 the apex of the peduncle of the last pair; the peduncle is three times as long as broad, 

 and much shorter than the peduncle of the first pair; the inner ramus is much shorter 

 than the peduncle; the outer ramus is much shorter than the inner; both are smooth. 

 The peduncle of the third pair is four times as long as broad, and twice as long as the 

 rami, which are equal in length, and smooth. 



The telson is tongue-shaped, longer than broad, and only a little shorter than the 

 last ural segment; it is somewhat broader than, and half as long as, the peduncle of the 

 last pair of uropoda. 



The young male. 



PL XI, fig. 37. 



The forepart of the body is comparatively wider than in the adult male, and the 

 head is also a little larger. 



The first pair of antennae reach only a little beyond the under margin of the head 

 the flagellum consists of one longer and ten very short joints. 



