KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 13 



Tlic pereion is considei-ably longer and broadev in thc feinale than in the raale, the 

 tifth segment being the broadest. 



The yiv.si pair of pereiopoda (Pl. I, fig. 20 — 22) are a little shorter than the second ; 

 the fe mur is broad laminar, irregularly convex at the anterior margin and feebly curved 

 at the posterior, it is shorter than the four following joints together. The carpus is 

 Ijvoad but not at all produced at the hinder inferior corner. The raetacarpus is much 

 narrower and a little shorter than the carpus, complexly serrated along the posterior 

 margin, each of the broad, strong teeth being three-pointed (Pl. I, fig. 22); the lower 

 margin is provided with short sharp spines around the base of the dactylns. The dac- 

 Tylns is curved, longer than half the metacarpus, the posterior margin fringed with some 

 few unequal sharp spines. 



Tlie second pair (Pl. I, fig. 23 and 2-i) have the femur long, narrow, almost linear, 

 the hinder margin feebly convex; a little above the lower, hinder corner there is a strong 

 1)ristle. The femur is longer than the four following joints together. The ge nu is short 

 Avith two bristles at the lower hinder corner. The tibia is broadly produced at the lower 

 hinder corner, can-ying 5 — 6 long bristles. The carpus is very broad and stout, the 

 spoonshaped carpal process is serrated along the lower margins, smooth at the hinder 

 margin, reaching almost to the middle of the metacarpus. The metacarpus is a little 

 shorter than the carpus, broader at the base, the anterior margin slightly convex; the 

 hinder margin is provided with a irregularly serrated crest formed of long and short sharp 

 teeth: the inferior margin is bordered wth short sharp spines as in the first pair. The 

 dactylns is curved, scarcely longer than half the metacarpus, strongly serrated along the 

 jiosterior margin (Pl. I, fig. 24). 



The third and fourth pairs (Pl. I, fig. 2.5 and 26) are a third longer than the second 

 pair, stout; the femur is narrow, the tibia is longer than the carpus, both smooth. The 

 raetacarpus is longer than the carpus, provided with a row of short, equidistant spines 

 along the posterior margin and some few bristles at the sides of the row of spines. The 

 dactylus is longer than half the metacarpus, indistinctly pedunculated ^), the peduncular 

 part finelv serrated along the posterior margin. 



The fifth and sixth pairs (Pl. I, fig. 27 and 28) are nearly twice as long as the 

 two preceding pair"s (15:8). The femur is broad laminar, a little longer and broader in 

 the sixth pair; the anterior margin is slightly convex provided with some few short bristles. 

 The tibia is a little shorter than the carpus. The anterior margin of the carpus is 

 armed with a roAv of short spines and some few bristles. The metacarpus is not twice 

 as long as the carpus but almost as long as the both preceding joints together, evenly arched, 

 and armed along the anterior margin with a comb-like rowe of fine slender bristles. The 

 dactylus is slightly curved, distinctly pedunculated, without serration. It is shorter than 

 a foui^th of the length of the metacarpus. 



The seventh pair (Pl. I, fig. 29 and 30) are longer than the femur of the sixth pair. 

 The femur is shorter than the femur of the sixth pair (8:11), broader above, the anterior 

 margin armed with some short bristles, the posterior almost straight. It is a little more 



') I call the dactylus pedunculated when it shows a basal part more -or less distinctly marked from the 

 terminal one. Sometimes this peduncular part grows very thick. 



