32 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. 



hirsute at long the lower third of their length; the lower margins are densely beset with 

 long, straight, stout spines. 



The second pair of maxillae (PL IV, tig. 11) consist of a high rectangular basal 

 portion and two lamina 3 at the lower end; the outer is thin, broad, hollowed, and 

 embraces the inner; it is undulated at the free margin, rounded, and nearly divided in 

 two parts by a deep fissure. The inner lamina is thick, ovate, Avith four or five strong, 

 tooth-like spines at the apex; the inner side is hirsute. On the inner side of the basal 

 portion there is an accessory lamina, almost quadrate, densely hirsute on the inner side. 



The maxillipeds (PI. TV, fig. 12 and 13) show a short basal portion projecting in- 

 wards between the maxilla?, with a feebly hirsute, thick process. At the lower end the 

 basal portion carries a small median lamina, fringed with long hairs, and two lateral lobes 

 (homologa of the palps in the Gammarids and Synopids). The lateral lobes are broad, 

 hollowed, rounded at the ends; the inner margins are densely fringed with very long hairs, 

 the outer sparingly beset with short hairs. 



The pereion is strongly arched above and below, more arched in the female than in 

 the male, provided with a dorsal crest. The first segment is scarcely longer than the 

 seventh, the fourth is the longest, the third only a little shorter (14:15). The sides of 

 the segments are prominent so as to form a kind of elevated facets. 



The epnmerals of the first pair are very small and narrow, those of the fifth pair 

 the largest, all rounded below. 



The branchial sacks are very small on the second and third pairs, large on the 

 fourth, fifth, and sixth pairs. 



The first pair of pereiopoda (PL IV. fig. 14) are very robust; the femur is broadly 

 ovate, twice as long as broad; the inner anterior side dilates into a thin lamina for the 

 protection of the last joints when the leg is folded up; the high ridge on the femur 

 behind this laminar part is fringed with long slender hairs, the posterior margin of the 

 joint is beset with some few short hairs. The genu is small, the lower posterior part of 

 the tibia is broadly produced to half the length of the carpus. The carpus is very large, 

 almost triangular, as long as broad; the anterior margin curved, the posterior straight, 

 the inferior feebly excavated and densely fringed with long hairs. The metacarpus is 

 very thick, conical, not longer than the diameter of the base, beset with short hairs, and 

 a little broader than two thirds of the length of the inferior margin of the carpus. The 

 dactjdus almost straight, shorter than half the metacarpus. 



The second pair (PL IV, fig. 15) are a third longer than the first pair, and a little 

 more slender. The femur is almost linear. The tibial process is longer than a third of 

 the carpus. The carpus is much narrower than in the preceding pair, twice longer than 

 broad; the inferior margin is excavated, fringed with hairs. The metacarpus is elongate, 

 tapering towards the end, the posterior margin feebly excavated, with a few short equi- 

 distant hairs; the anterior margin is feebly curved; with four very short hairs; the 

 metacarpus is shorter than the carpus (5:6). The dactylus is short and stout, scarcely 

 equalling a fifth of the length of the metacarpus. 



The third and fourth pairs (PL IV, fig. 16) are equal in length, and of the same 

 form. The femur is short, laminar, the anterior margin straight; a little behind the very 



