KONGL. SV. VET. AKADEMIENS HANDL1NGAR. BAND. 22. N:0 7. 335 



The first pair of perceopoda (PL XV, fig. 23) are only a little shorter than the 

 second. The femur is linear, about five times as long as broad, and quite as long as 

 the three following joints together; the under margin is fringed with short, spine-like 

 teeth, The genu is broader than long, and has the under margin armed as in the femur. 

 The tibia is considerably longer than the genu, and is armed in the same way. The 

 carpus is narrow, almost linear, and a little more than half as long as the femur; the 

 hind margin is feebly concave, and is fringed with equidistant, short spines. The meta- 

 carpus is somewhat narrower than, and a little more than half as long as, the carpus; it 

 tapers slowly towards the apex, and has the hind margin set with short spines. The dac- 

 tylitis is almost straight, and is about a fifth part as long as the metacarpus. Glands, 

 forming long bands, are developed in all the joints, except dactylus. 



The second pair (PI. XV, fig. 24 and 25) closely resemble the first, but are a little 

 longer, and have the carpus fully two-thirds as long as the femur, and the front and 

 under margins of the metacarpus fringed with short, slender bristles. The second pair 

 reach beyond the apex of the carpus in the third pair. 



The third and fourth pairs (PI. XV, fig. 26 and 27) are similar to the two pre- 

 ceding pairs but want the armature of spines. The femur is not fully five times as long 

 as broad. The carpus is as long as the femur, and is twice as long as the metacarpus. 

 The dactylus is feebly curved, and almost a fourth part as long as the metacarpus. 

 Glands are developed as in the preceding pairs. 



The fifth, sixth, and seventh pairs (PI. XV, fig. 28 — 31) are similar to the preceding 

 pairs in form, but the fifth pair is a little longer than the sixth and seventh; these last 

 pairs are equal in length, and shorter than the third and fourth pairs. The femur is about 

 five times as long as broad, and is, in the fifth pair, as long as, in the sixth and seventh, 

 much longer than, the three following joints together. The metacarpus is not, half as 

 long as the carpus, in the fifth pair; in the sixth and seventh pairs it is a trifle more 

 than half as long as the carpus. The dactylus is about a third part as long as the 

 metacarpus, and has an ovate opening for the glandular secretion at the base. 



The pleon is not deeper than the peraeon, and is a little shorter than the last four 

 pereeonal segments together; the hind corner of the pleonal segments is obtusely rounded. 



The pleopoda (PI. XV, fig. 32). The peduncle is considerably longer than the rami. 

 The coupling spines are six in number planted in a straight row; the stem is perfectly 

 smooth (PL XV, fig. 32). I could not detect any cleft bristle. The rami of the first pair 

 have nine joints each. 



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

 broader, and a trifle longer, than the last coalesced segment, which is nearly twice as 

 broad at the base as it is long. 



The uropoda (PL XV, fig. 33). The first pair reach beyond the apex of the last 

 pair; the peduncle is dilated, laminar, twice as broad at the apex as at the base, nearly 

 three times as long as broad at the apex, and not fully twice as long as the inner ramus; 

 the inner margin is fringed with spine-like teeth; the rami are lanceolate, equal in length, 

 and sharply serrated on both margins; they are inserted near the corners of the peduncle, 

 so that there is a wide space left between them. The second pair reach about to the middle 



