KONGL. SV. VET. AKADEM1ENS HANDLINGAR. BAND. 21. N:0 5. 33 



thin margin the joint thickens abruptly and is fringed with long slender hairs. Against 

 this Avail the tibia impinges when the leg is folded up. The hinder margin is feebly curved, 

 coarsely serrated, and fringed with hairs. The tibia is longer than the carpus (24:19); 

 both carry a few short hairs along the hinder margins. The metacarpus is narrow, 

 linear, as long as the carpus. The dactyl us is small, feebly curved, fixed as usual 

 terminally at the tip of the metacarpus. 



The fifth pair are longer than the fourth (8: 7), but much shorter than the sixth (2:3). 

 The femur is long, linear; the tibia is longer than the carpus; the metacarpus is a 

 little shorter than the carpus; the dactylus has the same articulation and form as that de- 

 scribed below in the sixth pair. 



The sixth pair (PI. IV, fig. 17) are only a little longer than the pereion (36:35). 

 The femur is tolerably broad, linear, the anterior and posterior margins are straight: 

 the tibia and carpus are almost equal in length, the margins smooth. The metacarpus 

 is elongated, slender; the lower end is rounded, deeply hollowed on the anterior side, 

 forming a spacious pit for the reception of the dactylus when this joint is retracted. The 

 dactylus is fixed subterminally, a little above the rounded lower end; it is strongly 

 curved, of the same form as the claw of a cat, very sharp-pointed; the inner concave 

 margin is beset with long spines. 



The seventh pair (PI. IV, fig. 18 and 19) are scarcely a sixth shorter than the fourth 

 pair, and exactly half as long as the sixth pair. The tibia is longer than the carpus; 

 the carpus equals two thirds of the length of the metacarpus- The lower end of the 

 metacarpus is a little broader, hollowed as in the preceding pair. The dactylus is fixed 

 as in the sixth pair, the concave mai^gin indistinctly serrated. 



The pleon is much shorter than the last three pereional segments (10:14), the dorsal 

 line sIioavs no serration; the lateral parts of the segments are evenly rounded below. 



The pleopoda are provided with long, narrow peduncles, a little shorter than the 

 rami; the outer ramus has 16 — 17, the inner 20 — 22 joints; the cilia? are shorter than 

 the rami, simple, shortly plumose. 



The ur'us, without the telson, is shorter than the last two pleonal segments. The 

 second and third ural segments are coalesced into one, scarcely longer than the first segment. 



The uropoda (PL V, fig. 1) are short and broad, the peduncles are thick, almost 

 prismatic; the peduncles of the first and second pairs are finely serrated along the outer 

 margins and provided with a few hairs along the inner. The peduncle of the third 

 pair, scarcely longer than the last ural segment, is smooth on the outer margin and 

 sparingly beset with hairs along the inner. The rami of the first pair are equal in length, 

 acute, serrated. The exterior rami of the last two pairs are a little shorter than the interior, 

 serrated along the inner margins; the interior rami are acute, serrated along both margins. 



The telson is long, broad, feebly serrated behind; it is longer than the peduncle of 

 the last pair of uropoda. 



K. Vet. Akad. Hand]. Band 21. N:o 5. 



