324 CAUL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPEKIID^E. 



Phronimopsis Sarsi. 



cavated, gouge-shaped process are serrated. (PI. XIV, fig. 23). The dactylus is curved, 

 a fifth or sixth part as long as the metacarpus, and has a circular opening at the base. 



The pleon is much longer than the peraeon, almost as long as the head and peraeon 

 together. The segments are much deeper than the peraxm, with the hind corner rounded, 

 and a very short, spine-like, dorsal projection in the median line. The first segment is as 

 long as the last three pergonal segments together. 



The pleopoda (PL XIV, fig. 25 — 27) have the peduncle egg-shaped, and longer than 

 the rami. The two coupling spines (PI. XIV, fig. 26) are thick and stout, with two 

 hook-like teeth on each side of the stem. The cleft bristle (PI. XIV, fig. 27) is densely 

 fringed with cilia, and has the apically dilated arm usually quite as long as the other; 

 above the cleft bristle there is a tuft of long simple hairs on the side of the first joint 

 of the ramus. The rami of the first pair have six joints each. 



The urus is considerably shorter than the last pleonal segment. The first ural seg- 

 ment is fully twice as long as, and much broader than, the last coalesced, which is more 

 than a third part broader than long. 



The uropoda (PI. XIV, fig. 28 and 29). The first pair reach almost to the apex 

 of the last pair; the peduncle is almost linear, five times as long as broad, and has the 

 inner margin fringed with minute hairs; the rami are narrowly elongated and sharp- 

 pointed, equal in length, and have both margins fringed with minute hairs (PI. XIV, 

 fig. 29); they are about four-fifths as long as the peduncle. The second, pair reach 

 beyond the middle of the outer ramus in the third pair; the peduncle and rami are like 

 those in the first pair. The peduncle of the third pair is linear, more than six times as 

 long as broad; the inner margin is fringed with minute hairs; the rami are like those in 

 the preceding pairs but shorter; the inner ramus is a trifle longer than the outer, and is 

 scarcely more than half as long as the peduncle. 



The telson is broadly rounded, and about a third part as long as the last coalesced 

 ural segment; it is broader than, and about a sixth part as long as, the peduncle of the 

 last pair of uropoda. 



