224 CARL BOVALLIUS, AMPHIPODA HYPERI1DEA. I. 2. HYPERIIDJc. 



Hyperia schizogeneios. 



fourth pairs, and about as long as the three following joints together. The carpus is 

 distinctly longer than the tibia, and has the front margin serrated. The metacarpus is 

 only a little longer than the carpus, with the front margin serrated. The dactyl us is 

 half as long as the metacarpus. 



The pleon is about as long as the peraaon but scarcely more than half as broad. 

 The lateral parts of the segments are rounded behind. 



The pleojpoda. The outer ramus has eight joints, the inner seven. 



The urus is longer than the last pleonal segment. The first ural segment is a third 

 longer than the last coalesced, which is nearly as long as broad. 



The uropoda. The first pair reach to the apex of the last pair; the peduncle is about 

 five times as long as broad, and is only a little longer than the inner ramus; the rami 

 are narrowly elongated and sharp-pointed; the outer is somewhat shorter than the inner, 

 and is serrated along the inner margin; the inner ramus is serrated along the outer 

 margin. The second pair reach a little beyond the apex of the peduncle of the last pair; 

 The peduncle is narrow, linear, about four times as long as broad, and is quite as long 

 as the inner ramus; the rami are like those in the first, pair. The peduncle of the third 

 pair is four times as long as broad, and a third longer than the inner ramus; the rami 

 are equal in length, and are armed as in the preceding pairs. 



The telson is longer than broad, narrowed at the apex, and sharp-pointed; it is 

 about as long as the last coalesced ural segment, twice as broad, and more than half as 

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



Stebbing remarks (1. c. p. 1394) that he found in the »Challenger» collection a 

 specimen labelled »Zebu Harbour, Philippines,)) which closely resembles Hyperia 

 schizogeneios, but differs by some minor characteristics; if it should need a specific 

 name of its own, he proposes to call it H. zebui. He says: 



»The features of difference which this specimen presents are that the head is less deep; the 

 wrist of the first gnathopods has on the straight hind margin two spines, one on and three within the 

 apex, and the straight hind margin of the hand is pretty strongly pectinate on the lower part; 

 the third joint of the second gnathopods has four spines about the apex, the wrist has the pro- 

 duced part beset with eight spines, the hand has two on its front margin; in the first perreopods 

 the fourth joint is rather conspicuously broad; the hinder corners of the first three pleon-seg- 

 ments are squared, but. perhaps the actual angles a little more rounded than in the Atlantic 

 specimen; the first two pairs of pleopods have seven joints to each ramus, the third pair has 

 six; the telson is a little more elongate.» 



