218 CAEL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID^E. 



Hyperia promontorii. 



longer than the inner ramus; the rami are elongate, sharp-pointed, and provided with semi- 

 circular incisions as in Hyperia Fabrei; the inner ramus is longer and somewhat narrower 

 than the outer, with the outer margin finely serrated; the outer ramus has the inner margin 

 serrated, and the outer smooth. The second pair reach nearly to the middle of the outer 

 ramus of the last pair; the peduncle is broader than that in the first pair, but more than 

 twice as long as broad, and longer than the inner ramus; the rami are broader than in 

 the first pair, elongate-ovate, sharp-pointed, equal in length, and provided with semicircular 

 incisions; they are serrated as in the first pair. The peduncle of the third pair is broader 

 than that in the second, considerably more than twice as long as broad, and nearly twice 

 as long as the inner ramus; the rami are somewhat narrower and shorter than in the 

 preceding pair, but armed in the same way. 



The telson is triangular with slightly curved margins, about as long as broad, and 

 more than half as long, as the last ural segment; it is quite as broad, and less than half 

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



The female. 



PL XT, fig. 7, 9, 12 and 13. 



The body is broader and wider than in the male. The head and perseon together 

 are longer than the pleon, but somewhat shorter than the pleon and urus together. 



The first pair of antenna? reach a little below the under margin of the head; the 

 single flagellar joint is about twice as long as the whole peduncle. 



The second pair of antenna} are scarcely more slender than the first. 



The peroson. The first two coalesced segments are almost as long as the next 

 three together. 



The first and second pairs of perceopoda are exactly like those in the male. 



The third, and fourth pairs (PI. XI, fig. 7) are somewhat more robust than in the 

 male, with the tibia and carpus a trifle broader; the bristles on the hind margin of the 

 carpus are shorter, but the serration is more distinct. 



The fifth, sixth, and seventh pairs (PL XI, fig. 9) are like those in the male, but 

 the femur is perhaps somewhat broader. The metacarpus is a little longer than two 

 thirds of the femur. The dactylus is much longer than a third of the metacarpus. 



The pleon is only a little longer than the person; the first segment is as long as 

 the last two pergonal segments together. 



The urus is broader than in the male, and scarcely more than half as long as the 

 last pleonal segment. 



The uropoda (PI. XI, fig. 12 and 13) are only a little broader and shorter than in 

 the male. 



