KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 393 



The first pair of perceopoda (Pl. XVI, fig. 54) have the fe mur narrowlj' liiiear, 

 raore than ten times as long as broad, and considerably longer than all the following 

 joints together. The tibia is scarcely longer than the gcnu. The carpus is longer than 

 the two preceding joints together, and has a small, tooth-like projection on the hind margin 

 near the apex, but does not form a carpal process of any kind. The metacarpus is as 

 long as the carpus, with a feeble serration on the hind margin near the apex, and two 

 feebly curved dactyloptera, vvhich are considerably longer than half the dactylns. The 

 dactylus has a blunt secondäry tooth near the apex on the hind margin. 



The second pair (Pl. XVI, fig. 55) are longer than the first and reach quite to the 

 apex of the femur in the third pair. The femur is like that in the first pair, and is 

 longer than all the following joints together. The carpus is twice as long as the two 

 preceding joints together, and is armed as in the first pair. The metacarpus is a little 

 shorter than the carpus. The dactylus is scarcely a third part as long as the meta- 

 carpus. 



The third pair are nearly as long as the head, perason, and pleon together. The 

 femur is very elongated, narrowly linear, and is about fifteen times as long as broad. 

 The genu is short; the tibia elongated, about half as long as the femur; the carpus is 

 elongated, feebly tapering towards the apex, and is only a little shorter than the femur. 

 The metacarpus is very elongated, filiform, and is soraewhat longer than the femur. 

 The dactylus is spine-like, immoveably fixed at right angles to the metacarpus. 



The fourth pair are much shorter than the third, equalling in length only the head 

 and the six first perasonal segments together. The femur is narrow, linear, and a little 

 more than half as long as that in the preceding pair. The carpus is a little shorter 

 than the femur, and the metacarpus is shorter than the carpus. 



The jifth pair (Pl. XVI, fig. 56) are much longer than the fourth, and reach to the 

 apex of the carpus in the third pair, being a little longer than the head and perceon 

 together. The femur is very elongated and almost linear, about twelve times as long as 

 broad, and without distinct teeth on the front margin. The genu is longer than broad. 

 The tibia is not half as long as the femur, very feebly marked with tooth-like prominences 

 on the front margin. The carpus is a little longer than the tibia, and about half as 

 long as the femur; it is nearly five times as long as it is broad near the apex, and has 

 five or six low teeth on the front margin and a somewhat larger one near the apex. 

 The metacarpus is feebly arched, slender, and about a third part as long as the meta- 

 carpus. The dactylus is very rainute. 



The sixth and seventh pairs are equal in length and tolerably similar in shape. 

 The femur is a little broader below than above; that in the seventh pair is a little longer 

 than in the sixth. The carpus is longer than the tibia, and the metacarpus is scarcely 

 half as long as the carpus. 



The p)leon is slender and is quite as long as the whole pera?on. The first segment 

 is the longest, and is longer than the last perseonal segment. 



The pleopoda have the peduncle elongate and slender, and longer than the rami. 

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



50 



K. Sy. Vet. Akad. Handl. Band. 22. N:o 7. " ' 



