KONGL. 8V. VET. AKADEMIKNS HANDLINGAR. BAND. 22. N:0 7. 29 



The hranehial säcks are attached to the third to sixth ])airs'of" perasopoda. They 

 are smaller in the female than in the iiiale. In the niale thosc of the fifth and sixth 

 pairs are the longest, but not half as long as the femur. 



The ovitectrices are large, smooth, attached to the second to fifth pairs of peneopoda. 



The fi,7'st pair of perceopoda (Pl. II, tig. 4) are the shortest of all. The femur is 

 very long, narrow, linear, rauch longer than all the following joints togethcr (5 : 3), Ihe 

 hiiid margin is straight. The genu is smooth, almost cubical. The tibia is scarcely 

 longer than the genu, the lower hinder corner produced, carrying three or four short 

 bristles. The carpus is as long as the two preceding joints together, considerably broader 

 below; the lower hinder corner is not produced but armed with a strong spine; the under 

 margin is perfectly straight, fringed with a row of short sharp bristles; the anterior and 

 posterior margins are sligthly convex. The metacarpus is almost as long as the carpus, 

 feebly bent, tapering toward the apex, with a short bristle at the apex. The dactylus 

 is pedunculated, with a short, sharp tooth at the hinder side, projecting fi'om the peduncular 

 part of the joint. All the joints are provided with glandular masses, but I have not 

 been able to find any outlet for the glands. 



The second pair (Pl. II, tig. 5 and 6) are longer than the fii"st. The femur is a 

 little longer and narrower than in the lirst pair, linear, in the male as long as, in the 

 female longer than all the following joints together. The genu is a little longer than 

 broad, longer than the tibia; both joints are totally smooth; the lower hinder corner of 

 the tibia is not produced. The carpus is long, narrow, linear, longer than a third of 

 the femur, smooth. The metacarpus is a little shorter than the carpus, and narrower, 

 linear, the apex projects into two thin, hollowed processes, fringed with hairs; these pro- 

 cesses reach a little farther than half the dactylus. The dactylus is robust, pedunculated, 

 with an appendicular tooth at the hinder side. The dactylus equals about a fourth of 

 the length of the metacarpus. In all the joints there are richly developed glandular 

 masses. 



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

 is narrow, linear, in the female as long as the three following joints together, in the male 

 a little shorter. The genu is scarcely longer than broad; the tibia is almost twice as 

 long as the genu, both joints smooth. The carpus is almost twice as long as the two 

 preceding joints together, linear, fringed with sorae short, equidistant bristles along the 

 hinder margin. The metacarpus is shorter than the metacarpus of the fifth and sixth 

 pairs and a little shorter than the next preceding joint, tapering, feebly curved, and totally 

 smooth. The dactylus is scarcely as long as a fourth of the metacarpus, pedunculated, 

 feebly curved, with a heel at the hinder corner of the base; in this heel is an oblong 

 aperture for the outlet of the glands which fill all the joints. 



The fifth and sixth pairs are equal in length as long as the two preceding pairs, and 

 a little longer than the peraeon. The joints are similar to those of the two preceding pairs, 

 except that the metacarpus is a little longer; all joints filled with glands. 



The seventh pair (Pl. II, fig. 7 and 8) are considerably shorter than the sixth pair, 

 reaching scarcely fai-ther than to the apex of the carpus of that pair. The femur is 

 narrow, feebly curved, only a little shorter than all the following joints together, but 



