KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 63 



a little shorter than the corresponding legs, those of the fifth and sixth pairs are shorter 

 than the branchial sacks, and not half as long as the corresponding legs. 



The first pair of perceopoda (PI. V, fig. 13). The femur is elongate-ovate, about 

 twice as long as broad, with some slender hairs at the lower hinder corner. The genu 

 is as long as broad, provided with hairs at the lower hinder corner. The hind margin 

 of the tibia is as long as the hind margin of the genu, the under margin is fringed with 

 long hairs. The carpus is more than half as long as the femur, a little broader below, the 

 lower hinder corner not produced; the hind margin is provided with long hairs, the under 

 margin is straight, fringed with stout bristles. The metacarpus is shorter than the 

 carpus, evenly tapering toward apex, which is rounded, the joint is all around beset with 

 short hairs, intermixed with some longer ones on the hind margin; in front of the dac- 

 tylus the apex projects into a very short tooth. The dactylus is straight slender, equall- 

 ing a third of the length of the metacarpus. Glands in all joints. 



The second pair (PL V, fig. 14). The femur is narrower than the femur of the 

 first pair, three times as long as broad, with some few hairs at the lower hinder corner. 

 The genu is longer than the tibia, both joints carrying hairs on the lower hinder corners. 

 The carpus is not half as long as the femur, almost linear, about twice as long as broad, 

 not produced at the lower hinder corner, and carrying some few short hairs on the hinder 

 and under margins. The metacarpus is longer than the carpus, evenly tapering, hirsute 

 as in the first pair; the apex projects into a minute tooth in front of the dactylus. The 

 dactylus is straight, slender, equalling a sixth of the length of the metacarpus. Glands 

 in all the joints. 



The third pair (PI. V, fig. 15) are the longest of all. The femur is elongate, a 

 little broader below, almost four times as long as broad, and much longer than the three 

 following joints together; both margins are smooth. The genu is as long as broad, smooth. 

 The tibia is tolerably broad, but much narrower than the femur, and scarcely equalling a 

 third of its length; the front margin is curved, with two or three slender hairs, the lower 

 corner is produced, and tipped with two short hairs; the hind margin is feebly curved, with 

 four indistinct teeth, each tipped with a hair. The carpus is much longer, but narrower 

 than the tibia, half as long as the femur; the margins are smooth, but the joint carries 

 a row of long hairs on the outer side, a little before the hind margin. The metacarpus 

 is narrow, slender, shorter than, and not half as broad as the carpus; the front margin 

 is smooth, the hind indistinctly serrated, the outer side is provided with hairs as in the 

 preceding joint. The dactylus is short, feebly curved, scarcely equalling a fifth of the 

 length of the metacarpus. Well developed glands in all the joints, especially in the carpus 

 and metacarpus. 



The fourth pair (PL V, fig. 15) are considerably shorter than the third. The femur 

 is elongate, as long as the three following joints together, and a little more than thrice as 

 long as broad; the margins are smooth. The genu, tibia and carpus as in the preceding 

 pair. The metacarpus is a little shorter and much narrower than the carpus, but almost 

 half as long the femur; it is broader at the base, tapering downwards; the front margin 

 has four to five long hairs, and the lower anterior corner a bundle of hairs in front of 

 the dactylus, all the hairs curved at apex; the hind margin shows thirteen to fourteen 



