194 CAEL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIIDiE. 



Hyperia sphngera, 



The jifth, sixth and seventh pairs are not longer than the two preceding pairs. The 

 femur is soinewhat shorter and narrower than that in the thii'd and fourth pairs, having 

 the margins smooth. The genu is longer than broad, and sinooth. The tibia is not fully 

 twice as long as the genu, and has the margins smooth; it is sornewhat broader in the 

 last two pairs than in the fifth. The carpus is as long as the tibia; in the fifth pair 

 the front margin is fringed with minnte spines, biit is smooth in the two last pairs. 

 The metacarpus is as long as in the third and fourth pairs, with the margins smooth. 

 The dactylus is longer than a fourth part of the metacarpus. Glands as in the preced- 

 ing pairs. 



The pleon is as long as the whole perteon; the fii'st segment is quite as long as 

 the last two perteonal segments together. The lateral parts of the pleonal segments are 

 rounded below and behind. 



The pleopoda (Pl. X, fig. 37 and 38). The peduncles are compressed, with the front 

 and hind sides strongly convex. The coupling spines are stout, but dissimilar in 

 form, at least in the type-specimen examined, (Pl. X, fig. 37). The outer ramus has 

 eighteen joints, the inner seventeen. 



The iirus is fully as long as the last pleonal segment; the first ural segment is 

 considerably longer than the last coalesced, which is more than half as long as it 

 is broad. 



The uropoda (Pl. X, fig. 39). The first pair do not reach to the apex of the last 

 pair; the peduncle is linear, three times as long as broad, and much longer than the inner 

 ramus; the outer ramus is soineAvhat shorter than the inner, narrower at the base than 

 it is a little below the middle, and suddenly narrowing at the apex which is very sharp- 

 pointed; the inner margin is finely serrated; the inner ramus has the same form as the 

 outer and is finély serrated along the outer margin, while the inner margin is smooth. 

 The second pair reach almost as far back as the first pair; the peduncle is broader; it is 

 scarcely twice as long as broad, but longer than the inner ramus; the outer ramus is 

 much shorter and narrower than the inner, elongate-ovate, with abruptly narrowed, sharp- 

 pointed apex; the inner margin is serrated; the inner ramus is constricted at the base 

 and apex, the sides running parallel between them; the apex is sharp-pointed ; the outer 

 margin and the lowest part of the inner are finely serrated. The peduncle in the 

 third pair is much broader than that in the second, narrower at the base than at the 

 apex, and t^vice as long as it is broad at the apex; it is not fully twice as long as the 

 inner ramus; the outer ramus is as long as the inner, but narrower, and of the same 

 form as in the second pair; the inner ramus is only a little longer than the bi-eadth of 

 the peduncle, very broad and almost circular, with both margins finely serrated and the 

 apex abruptly narrowed and sharp-pointed. 



The telson is longer than broad, tongue-shaped, and somewhat shorter than the 

 last ural segment; it is nearly as broad, and more than half as long, as the peduncle of 

 the last pair of uropoda. 



