KONGL. SV. VET. AKADIvMllCNS HANIJLINGAK. BAND. 22. N:() 7. 417 



The ejrivwrals (Pl. XVII, tig. 1, "i, iiiid 22) of the lirst and sccuiid pairs of perajo- 

 poda impinge on the under margin of the eoalesced tirst and secoiid penvonal segment. 

 That of the tirst pair is very deep and narrow, feebly cnrved, and nearly fonr times as 

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

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

 is much longer than the under margin of the third perteonal segment, with the eiids 

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

 than deep, and have the corners rounded. 



The hranchial vesides are well developed and are somewhat longer than the corre- 

 sponding femora in the second, third, and fourth pairs of pera^opoda; in tlie fifth and sixth 

 pairs they are a little shorter. 



The first pair of perceoijoda (Pl. XVII, tig. 10 and 11) are tolerably short. The 

 fem ur 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. 

 Glan ds 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 fem ur 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 pai't as long as the metacarpus. Glands 

 are present in all the joints. 



The third and fourth i^airs (Pl. XVII, fig. 14 and 15) are subequal in length. The 

 fem ur is narrow, feeblj' 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 

 pectinaled; 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. Sv. Vet. Akad. Handl. Band. 22. N:o 7. ^^ 



