KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 377 



The first pair of perceopoda (Pi. XVI, fig. 22 and 23) reach far beyond the lower 

 end of the head. The femur is almost, as long as the four following joints together. 

 The carpal process is more than half as long as the metacarpus. The dactyloptera 

 are broadly triangular, and are only a little shorter than the dactylus. 



The second pair do not fully reach to the middle of the carpus in the third pair. 

 The carpal process is quite half as long as the metacarpus. 



The third and fourth pairs are similar in shape and equal in length. The carpus 

 is only a little longer than the two preceding joints together, and is quite as long as the 

 metacarpus; the hind margin is finely pectinated, and set with six or seven equidistant, 

 short hairs. 



The fifth pair (PI. XVI, fig. 24) reach considerably beyond the apex of the fourth. 

 The femur is broader below, five times as long as it is broad at the apex, and is provided 

 with a sharp-pointed process above the lower hind corner; the femur is much shorter 

 than the tibia and the stem of the carpus together. The tibia is a little longer than the 

 genu, ovate, and much constricted at the base. The carpus is thick and swollen, with 

 the stem about a third part longer than broad; the tubercle on the under margin of the 

 joint is distinctly two-pointed and feebly crenulated. The carpal process is short, not a 

 third part as long as the stem of the joint, and not twice as long as the two-pointed 

 tubercle; it is about a fourth part as long as the metacarpus. The metacarpus is 

 shorter than the stem of the carpus, and has a thick intumescence, set with hairs, on the 

 middle of the front margin. 



The sixth pair reach to the apex of the tibia of the fifth pair. The femur is almost 

 linear, somewhat more than three times as long as broad. The genu is broader than 

 long, with the lower front corner squared. The metacarpus is not half as long as the 

 carpus. 



The seventh pair (PI. XVI, fig. 25) are longer than the sixth. The femur is long 

 and narrow, with the hind margin feebly convex and the lower front corner bluntly trun- 

 cated; it is about a third part longer than the femur in the sixth pair. The genu is broader 

 than long, with the lower front corner broadly rounded. The carpus is shorter than 

 the two preceding joints together. The metacarpus is only a little shorter than the carpus. 



The pleon is only a trifle longer than the last three peraeonal segments together. 

 The lower hind corner of each segment is angular, but not produced into a sharp point. 



The urus is longer than the last pleonal segment. The first ural segment is nearly 

 twice as long as the last coalesced, which is as broad as long. 



The uropoda (PI. XVI, fig. 26). The first pair do not reach to the apex of the last 

 pair. The peduncle is somewhat more than a third part longer than the inner ramus, 

 which is Considerably longer than the outer. The second pair reach fully to the apex of 

 the peduncle in the third pair. The peduncle is not twice as long as the inner ramus; 

 the outer ramus is longer than the inner. The peduncle of the third pair is a third part 

 longer than the inner ramus; the rami are almost equal in length. 



The telson is semicircular, much broader than long, and is more than half as broad 

 as the hind part of the last ural segment. 



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



48 



