KONGL. SV. VET. AKADEMIKNS HANDLINGAR. BAND. 21. N:0 5. 49 



The second pair of antennas (PI. VII, fig. 3) are seven- to nine-jointed in the male, 

 and five-jointed in the female; the third and fourth joints are the longest; the following, 

 which constitute the flagellum, are short, equal in length, provided with minute hairs. 



The mouth-organs will be described below at Vibilia robusta, p. 56. 



The pereion; the first segment is shorter than the second, the fifth is the longest. 



The first pair of pereiopoda (PI. VII, fig. 5) are a little shorter than the second. 

 The tibia is feebly produced at the hinder lower margin, the projection is shorter than 

 half the carpus. The carpus is shorter than the metacarpus, finely serrated along the 

 lower margins, and provided with some few strong spines at the lower corners. The 

 metacarpus is strongly serrated along the straight hinder margin and on the lower margins 

 round the base of the dactylus. The dactylus is very stout, feebly bent, serrated along 

 the posterior margin; it is half as long as the metacarpus. 



The second pair (PI. VII, fig. 6) with the tibial projection almost as long as the 

 carpus, broad at the apex, fringed with long stout spines. The hinder lower corner of the 

 carpus is produced into a stout, hollowed, spoon-shaped process, longer than half the me- 

 tacarpus; the margins are sharply serrated. The metacarpus is broad, as long as the carpus, 

 strongly serrated along the hinder margin and round the base of the dactylus. The 

 dactylus is shorter than half the metacarpus, strongly serrated along the hinder margin. 



The third and fourth, pairs (PI. VII, fig. 7) are equal in length; the tibia is a little 

 longer than the carpus, but not tumid; the metacarpus is longer than the carpus, strongly 

 serrated along the hinder margin. The dactylus is curved, scarcely as long as a third of 

 the metacarpus, with a feAv serrations on the hinder concave margin. 



The fifth and sixth pairs (PI. VII, fig. 8) are almost equal in length. The femur is 

 pretty broad, ovate. The tibia is a little longer than the carpus, smooth; the carpus 

 is shorter than the metacarpus; both joints are finely serrated along the anterior margins. 

 The metacarpus is much shorter than the two preceding joints together. The dactylus 

 is very short, shorter than a fourth of the metacarpus. 



The seventh pair (PI. VII, fig 9) are shorter than the fourth (7:9); the femur is 

 broad, laminar; the transformed dactylus is much longer than the metacarpus. 



The pleon is longer than the last four pereional segments; the hinder lateral corners 

 of. the third segment are not produced backwards as in the preceding species. 



The peduncles of the pleopoda (PI. VII, fig. 10) are shorter than the rami. The 

 rami consist of 12 — 13 joints; the cilia? are much shorter than the rami. 



The second and third ural segments together are shorter than the first, the second 

 is shorter than the third. The hinder corners of the last segment are rounded, not produced. 



The uropoda (PI. VII, fig. 11); the peduncles are much longer than the rami, pretty 

 broad, linear, the peduncle of the first pair is finely serrated on the outer margin. The rami 

 of each pair are equal in length, those of the first and second pairs are finely serrated 

 along both margins; the exterior ramus of the third pair is smooth on the outer margin. 



The telson is broad, semicircularly rounded, as long as the third ural segment, and 

 half as long as the peduncle of the last pair of uropoda. 



"K, Sv. Vet. Akad. ttandl. Band. 21. N:o 5. 



