228 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIIDiE. 



Hyperia criicipes. 



the rami, which are equal in length; the inner ramus is more than twice as long as the 

 breadth of the peduncle. 



The telson is half as long as, and much broader than, the peduncle of the last pair 

 of uropoda. 



The female. 



Pl. XI, fig. 14—16, 20, and 24—25. 



The hody is much broader than in the male; the pleon and urus together are 

 much shorter than the pera;on. 



The head is a little shorter than the coalesced portion of the perseon. 



The first pair of antennen (Pl. XI, fig. 15) do not reach to the under margin of 

 the head. The first joint of the peduncle is more than twice as long as the two follow- 

 ing joints together; the second joint is more than three times as long, as the third. The 

 single joint of the tlagellum is evenly tapering towards the apex, and is fully twice as 

 long as the whole peduncle; the under side is notched, and set with a few long 

 olfactory hairs. 



The second pair of antennce. (Pl. XI, fig. 16). The peduncle consists of only one 

 free joint, which is about twice as long as the glandular cone. The single flagellar joint 

 tapers evenly towards the apex, is sraooth, and twice as long as the peduncle. 



The perceon. The coalesced portion is quite as long as the next three segments 

 together. The seventh segment is nearly twice as long as the sixth. 



The jirst and second jjair of lierceopoda are similar to those pairs in the raale. 



The third and fourth pairs (Pl. XI, fig. 20) are somewhat stouter than in the 

 male, and the carpus is more tumid. The metacarpus is as long, and not half as 

 broad, as the carpus. 



The fifth, sixth, and seventh p)airs (Pl. XI, fig. 24 and 25) are considerably thicker 

 than in the male. The dactylus of the fifth and sixth pairs is provided with such a 

 forked projection as in the male; the dactylus of the seventh pair is transformed into a 

 spout-like organ like that described from Hyperia medusartim and other species. 



The pleon is as long as the last four pereeonal segments together; the first pleonal 

 segment is as long as the last pera-onal. 



The iirus. The first segment is a little longer than, and nearly twice as broad as, 

 the last coalesced, which is more than a third part broader than long. 



The uropoda are like those in the male, but the peduncles are a trifle broader. 



The telson is nearly twice as broad as the peduncle of the last pair of uropoda. 



