KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 113 



The perceon; the first segment is scarcely half as long as the second; the second 

 to sixth segments are almost equal in length, the seventh is the longest. 



The epimerals are tolerably large, as long as the under margins of the correspond- 

 ing segments. That of the fourth pair is the longest. 



The branchial sacks are broad above, almost linear, somewhat shorter than the fe- 

 mora of the corresponding pairs of perasopoda. They are fixed to the second to sixth pairs. 



The first pair of perceopoda (PI. VII, fig. 32) are fully as long as the second pair, 

 and somewhat stouter. The femur is broad, only a little more than twice as long as 

 broad, the hind margin is straight, the front margin feebly convex. The genu is as long- 

 as broad, smooth. The tibia is longer than the genu, the lower hinder corner is not at 

 all produced. The carpus is broad and stout, the front and hind margins are straight; 

 the carpal process is short and broad, shorter than the rest of the carpus, it ends into a 

 narrow, tooth-like point; the thin and sharp, edge-like, front margin of the process is 

 fringed with spines, as is also the hind margin; the front margin is distinctly shorter 

 than the hind margin of the metacarpus. The metacarpus is broad, somewhat more 

 than twice as long as broad; the front margin is almost straight, feebly convex at the apex, 

 where the joint is produced into a broad, hollowed, spoon-shaped process, overlapping 

 the dactylus for more than half its length; the front side of this spoon-shaped process 

 is densely covered with bristle-like hairs; the margins are set with short spines; the hind 

 margin of the metacarpus forms a thin, sharp edge, finely serrated, with comparatively 

 long, spine-like teeth. The dactylus is straight, slender, sharp-pointed, not fully half as 

 long as the metacarpus. A long glandular string runs through the femur, and con- 

 tinues through the following joints to the apex of the metacarpus where it seems to end 

 in the spoon-shaped metacarpal process, just at the base of the dactylus. All the joints, 

 except the dactylus, are irregularly sprinkled with more or less round, deeply red spots. 



The second pair (PI. VII, fig. 33 and 34) have the femur narrower than that of 

 the first pair, fully three times as long as broad; the front and hind margins are almost 

 straight, without hairs or bristles. The genu is somewhat more long than broad. The 

 tibia is nearly twice as long as the genu, considerably broader below, the lower anterior 

 corner is not produced but provided with a tuft of minute hairs; the front and hind margins 

 are feebly convex, smooth. The carpus is not as broad as that of the first pair, the front 

 margin is straight, fringed with minute hairs, the hind margin is a little concavated, 

 fringed with minute hairs; the carpal process is strongly developed, scarcely shorter than 

 the rest of the joint, ending in a sharp point, this sharp-pointed apex is somewhat shorter 

 than that in the first pair; the hind margin of the carpal process is feebly convex, fringed 

 with minute bristles; the front margin is fully as long as the hind margin of the meta- 

 carpus, forming a broad, very thin, sharply serrated edge, the teeth in this serration are 

 narrow, sharp-pointed, spine-like, directed downwards. The metacarpus is very broad 

 owing to the largely developed, thin, edge-like, hind margin, which is serrated in the same 

 manner as the front margin of the carpal process; the metacarpus is scarcely more than 

 a third longer than it is broad; the front margin is feebly convex, the lower corner pro- 

 duced into a spoon-shaped process which is narrower and shorter than in the first pair, 



15 



K. Sv. Vet. Akad. Handl. Band. 22. N:o 7. 



