384 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PHRONIMIDjE. 



Phronima pacifica. 



than in the former species (= Ph. atlantica). The fifth joint curved, about as long as the an- 

 terior margin of the palm, a low convexity on the inferior margin. The first pair of caudal 

 appendages do not reach as far backward as the third pair, extending to, or slightly beyond, 

 the middle of the rami of the last pair; the second pair extends to, or slightly beyond, thepoint 

 of articulation of the rami of the third pair, and more than half way the length of the branches 

 of the first pair.» 



The description and drawings given by Stebbing in 1888 agree closely with the 

 specimens which I have examined and identified with Phronima pacifica. I refer the 

 reader to his splendid work, adding here a few details. 



Phronima pacifica comes nearest to Ph. Colletti, but differs in the length of the 

 third and fourth pairs of pera>opoda, in the armature of the fifth pair, and in the form 

 of the second pair of uropoda. 



The m a 1 e. 



PI. XVI, fig. 48—50. 



The forepart of the body is more elongated than in Phronima Colletti, the head 

 and perseon together being much longer than the pleon and urus together. 



The head is not twice as deep as long, and is fully as long as the first three pe- 

 rgonal segments together. 



The first pair of antenna? have the first peduncular joint more than twice as long 

 as the two following together. The first flagellar joint is about four times as long as 

 the whole peduncle, but is not twice as long as the head. The flagellar joints are six 

 in number. 



The second pair of antennae are only a little longer than the first, and reach scarcely 

 to the hind margin of the fourth pergonal segment. The flagellar joints are eight or 

 nine in number. 



The per aeon. The first two segments are a little deeper than the third. 



The first -pair of perceopoda. The carpal process is nearly half as long as the 

 metacarpus. The metacarpus is a little longer than the stem of the carpus. 



The second pair reach beyond the middle of the carpus in the third pair. 



The third and fourth pairs are similar in shape, but the fourth pair are a little 

 longer than the third; the fourth pair are considerably shorter than the head and peraeon 

 together. The metacarpus is considerably shorter than the carpus. 



The fifth pair (PI. XVI, fig 49) reach nearly to the apex of the fourth pair. The 

 lower hind corner of the femur is produced and sharp-pointed. The carpus is about 

 as long as broad, and is similar in shape to that in Phronima Colletti, the armature on 

 the under margin of the carpus consists of a longer, slightly crenulated tubercle near the 

 articulation of the metacarpus, and a smaller sharp-pointed tubercle at the middle of the 

 under margin. The carpal process is nearly a third part as long as the stem of the carpus. 

 The metacarpus is arched, and is a little longer than the stem of the carpus. 



