20 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. 



The epimerals are rounded below, those of the fifth pair are the largest. 



The first pair of pereiopoda (PI. II, fig. 22); the femur is comparatively broad, the 

 tibia very short, the carpus elongated, linear, fringed with slender hairs along the 

 posterior margin; the metacarpus is shorter than the carpus, narrow, conical, sparingly 

 beset with slender hairs; the dactylus is nearly straight, half as long as the metacarpus. 



The second pair (PI. II, fig. 23) are of the same form as the first, but the carpus 

 is not elongated, almost shorter than the metacarpus; the dactylus feebly curved, as long 

 as half the metacarpus. 



The third and fourth pairs with elongated carpi, which are longer than the tibia?, 

 and short dactyli. 



The fifth pair (PI. II, fig. 24) with the femur comparatively broad, linear, a little 

 constricted at the upper end. The anterior margin is strongly serrated, the spine-like 

 teeth, 9 in number, are directed downwards, pressed against the margin ; the teeth forming 

 the serration along the posterior margin are a little smaller, 10 — 12 in number; the 

 apical spine-like process is very strong, feebty curved, a little longer than the genu. The 

 tibia is shorter (17:19) and a little narrower than the carpus. The metacarpus is very 

 slender, five times longer than the dactylus. 



The sixth pair are as long as, or a little longer than, the fifth (20:19); the femur 

 is pretty broad, very feebly serrated, the tibia is a little shorter than the carpus; the 

 metacarpus as long as the carpus, curved; the dactylus is feebly curved. 



The seventh pair (PI. II, fig. 25) are half as long as the fifth or sixth pair; the 

 femur is a little broader above, nearly as long as all the following joints together (6:7); 

 the tibia is as long as the carpus, the metacarpus a little longer; the dactylus is slender. 



The pleon equals the length of the last four pereional segments. The lateral parts 

 of the segments are broadly rounded below. 



The pleopoda (PI. II, fig. 26); the peduncles are elongate-ovate, as long as the rami. 

 The inner ramus is 8-jointed, the outer 11-jointed. The cilia? are longer than the rami, 

 and pedunculated (PL II, fig. 27). 



The urus (PI. II, fig. 28); the second and third segments are coalesced, longer than 

 the first (4:5). 



The uropoda; the interior rami of the first pair are as long as the peduncle, those 

 of the last two pairs are much longer than the corresponding peduncles. The exterior 

 rami of the first two pairs are minute but longer than those of Tyro Sarsi. The exterior 

 rami of the last pair are very large, quite as long as the peduncles and only a fourth shorter 

 than the interior rami, the inner margins are feebly serrated. The first pair are minutely 

 serrated along the outer margin of the interior ramus, and strongly serrated along the 

 inner margin, the teeth spine-like. The second pair are smooth along the whole outer 

 margin and minutely serrated along the inner margin of the interior ramus. The third 

 pair are minutely serrated along the outer margin of the interior ramus, the whole inner 

 margin is smooth. The second pair reach beyond the first, and the third beyond the 

 second. All the pairs contain glands. 



