70 CARL BOVALLIUS, AMPH1PODA HYPERIIDEA. VIBILIDjE. 



The second pair of antennae are eight-jointed in the male, five-jointed in the female; 

 the last joint is the shortest. 



The first two pereional segments are equal in length, the fifth is the longest. 



The^rs^ pair of pereiopoda (PI. X, fig. 17) have the carpus as long as the metacarpus, 

 the posterior margin armed with two bristles. The convex anterior margin of the metacarpus 

 is armed with three bristles, the posterior margin is almost straight, regularly serrated. The 

 dactylus is much longer than half the metacarpus, sparingly serrated at the posterior margin. 



The second pair (PI. X, fig. 18); the carpus is almost longer than the metacarpus; 

 the carpal process is slender, sharp-pointed, shorter than the carpus itself, and scarcely as 

 long as the posterior margin of the metacarpus. The metacarpus is stout, the lower an- 

 terior corner produced into a tolerably long serrated process, the lower posterior corner 

 produced into a somewhat shorter process. The lower parts of the anterior and posterior 

 margins are sharply serrated. 



The third and fourth pairs (PI. X, fig. 19) have the tibia considerably longer than 

 the carpus (4:3); the tibia is narrow, not tumid; the posterior margins of the carpus and 

 metacarpus are minutely serrated. The dactylus is almost straight, much longer than half 

 the metacarpus (5 : 7). 



The fifth and sixth pairs (PI. X, fig. 20) are about a fourth longer than the fourth 

 pair, the sixth pair are a little longer than the fifth; the femur is laminar, linear with 

 rounded corners; the carpus and metacarpus are fringed along the anterior margins with very 

 short equidistant spines. The dactylus of the fifth pair is shorter than a third of the 

 metacarpus; the dactylus of the sixth pair is longer than half the metacarpus, irregularly 

 serrated at the anterior margin. 



The seventh pair (PI. X, tig. 21) are equal in length to two thirds of the fourth. The 

 femur has the anterior and posterior margins straight; it is scarcely as long as the three 

 succeeding joints together. 



The pleon is as long as the last six pereional segments; the lower margins of the 

 first two segments are rounded, with an obtuse angle just behind the middle. The lower 

 margins of the last segment are almost straight. 



The pleopoda have the rami scarcely as long as the peduncles. 



The second and third ural segments are coalesced, about a third shorter than the 

 first segment. The hinder corners are produced backwards into processes extending a 

 little farther than half the length of the telson. 



The uropoda (PI. X, fig. 22); the peduncles of the first and second pairs are linear, 

 a little longer than the rami, serrated along the outer margins. The rami of the first 

 pair are equal in length, lanceolate, strongly serrated along both margins. The interior 

 ramus of the second pair is lanceolate, much longer than the exterior, strongly serrated 

 at both margins. The peduncle of the third pair is only a little longer than the rami, 

 and much shorter than the last ural segment. The interior ramus is a, little longer the 

 exterior, minutely serrated. 



The telson is elongate, triangular, with the margins feebly convex; it is only a fourth 

 shorter than the peduncle of the last pair of uropoda. 



