KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 417 



The epimerals (PL XVII, fig. 1, 2, and 22) of the first and second pairs of per Seo- 

 poda impinge on the under margin of the coalesced first and second pergonal segment. 

 That of the first pair is very deep and narrow, feebly curved, and nearly four times as 

 deep as it is long (PL XVII, fig. 22); the epimeral of the second pair reaches only a 

 little beyond the middle of the first, and is twice as deep as long; that of the third pair 

 is much longer than the under margin of the third peneonal segment, with the ends 

 rounded; it is fully twice as long as it is deep. The following epimerals are much longer 

 than deep, and have the corners rounded. 



The branchial vesicles are well developed and are somewhat longer than the. corre- 

 sponding femora in the second, third, and fourth pairs of peraeopoda; in the fifth and sixth 

 pairs they are a little shorter. 



The first pair of perceopoda (PL XVII, fig. 10 and 11) are tolerably short. The 

 femur is about as long as the four following joints together; it is narrow and feebly 

 curved. The genu is as long as broad. The tibia is scarcely longer than the genu. 

 The carpus is a little shorter than the two preceding joints together, and is narrower 

 at the base than at the apex. The metacarpus is longer than the carpus, wide at the 

 base, with convex margins, and rapidly tapering from the middle towards the apex, the 

 margins fringed with short hairs. The dactylus is robust, curved, with an incision 

 on the hind margin near the apex ; it is scarcely a third part as long as the metacarpus. 

 Glands are present in all the joints. 



The second pair (PL XVII, fig. 12 and 13) are longer than the first, and reach 

 considerably beyond the apex of the tibia in the third pair. The femur is broader than 

 that in the first pair, and is about as long as the four following joints together. The 

 genu is broader than long. The tibia is as long as the genu. The carpus is almost 

 as long as the two preceding joints together. The metacarpus is three times as long- 

 as the carpus, wide at the base, and rapidly tapering towards the middle, its last half 

 being slender and cylindrical (PL XVII, fig. 13); the margins are fringed with short hairs. 

 The dactylus is feebly curved, and about a fifth part as long as the metacarpus. Glands 

 are present in all the joints. 



The third and fourth pairs (PL XVII, fig. 14 and 15) are subequal in length. The 

 femur is narrow, feebly bent at the base, and much shorter than the three following- 

 joints together. The genu is much longer than broad. The tibia is rather shorter than 

 the genu, with the lower portion very wide; the hind margin is fringed with minute 

 hairs. The carpus is about as long as the two preceding joints together; it is broad, with 

 the lower hind corner produced into a short process which is directed backwards, and is 

 a little longer in the fourth pair than in the third; the hind margin of the joint is notched 

 or incised, and is fringed with minute, spine-like hairs; the under margin is finely 

 pectinated; the front margin is feebly convex, and smooth. The metacarpus is as long as 

 the carpus, with the hind margin finely pectinated; in the third pair it reaches consider- 

 ably beyond the apex of the carpal process when folded, in the fourth pair it reaches 

 only a little beyond it. The dactylus is long and feebly curved; it is about half as long 

 as the metacarpus. 



K. St. Vet. Akad. Handl. Band. 22. N:o '. J " 



