304 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIIDJE. 



Evthemisto Gaudichaudii. 



which is more than a third part longer than the outer; the inner ramus is serrated on 

 the inner margin. The second pair reach nearly to the apex of the outer ramus in the 

 last pair; the peduncle is broad, somewhat broader below than at the base, with the lower 

 inner corner a little projecting and sharp-pointed; it is about three and a half times as 

 long as it is broad at the apex, and is a little longer than the inner ramus, which is much 

 broader, and somewhat more than a third part longer, than the outer ramus; the rami 

 are serrated as in the first pair. The peduncle of the third pair is broad, linear, about 

 five times as long as broad, and has the lower inner corner a little projecting and sharp- 

 pointed; it is a little more than a third part longer than the inner ramus, which is a third 

 part longer than the outer; both rami are serrated as in the first pair. 



The telson is triangular, with feebly curved margins, and is somewhat more than 

 half as long as the last coalesced ural segment; it is about as broad, and nearly a fourth 

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



The female. 



The body, especially the peraeon, is a little broader than in the male. The dorsal 

 carina is always distinct, but the projecting angles of the last pergonal, and of the pleonal, 

 segments are often less conspicuous, at least in young, and also in ovigerous females. 

 The head and perason together are much longer than the pleon and urus together. 



The first pair of antenna? are about as long as the head. The first peduncular 

 joint is half as long again as the two following together; the single flagellar joint is robust, 

 more than three times as long as the whole peduncle in the adult female, which has the 

 terminal part of the flagellum someAvhat curved, but not as much as in the young male 

 where it is bent downwards as a hook; the first half of the inner margin is coarsely 

 serrated. 



The second pair of antenna? are only a little longer than the first. The single fla- 

 gellar joint is half as long again as the whole peduncle. 



The person has the last four segments subequal in length. 



The ovitectrices are much larger than in Euthemisto libellula, irregularly triangular, 

 and broad below. 



The perceopoda are quite like those in the male, and in young females as well as 

 in young males the fifth pair are short, only a little longer, or not longer, than the sixth; 

 also the carpus in the third and fourth pairs, and the metacarpus in the sixth and seventh, 

 are shorter than in the adult. Often the dactylus, and even the metacarpus of the last 

 pair, or of the two last pairs, is transformed for giving an easy outlet to the glandular 

 secretion. 



The pleon is not as long as the last five peraeonal segments together. 



The urus is longer than the last pleonal segment; the first ural segment is about 

 a fourth part longer than the last coalesced, which is considerably broader than long. 



The uropoda are like those in the male. 



The telson is fully two-thirds as long as the last coalesced ural segment. 



