210 GAEL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERlIDvE. 



Hyperia Fabrei. 



The branchial sacks are shorter than the femora of the corresponding pairs. 



The first pair of perceopoda (PL X, fig. 44 and 45). The femur is not much dilated 

 more than twice as long as broad, and fully as long as the four following joints. The 

 genu is broader than long, with a bristle at the lower hind corner. The tibia is longer 

 than the genu, and is armed in the same way. The carpus is scarcely dilated and only 

 a little produced; the front margin is nearly straight, and smooth; the hind margin shows 

 a feeble notch in the middle, with a stout bristle; the minute carpal process is tipped 

 with a strong bristle, and its front margin is scarcely as long as a seventh part of 

 the hind margin of the metacarpus. The metacarpus is considerably longer than the 

 stem of the carpus, evenly tapering towards the apex, and more than twice as long as it 

 is broad at the base; the front margin carries a single bristle below the middle; the hind 

 margin is finely serrated, with simple teeth. The dactylus is curved, and more than 

 half as long as the metacarpus; the hind margin is smooth (PI. X, fig. 45). 



The second pair (PI. X, fig. 46) are a little longer than the first, and reach a little 

 beyond the middle of the carpus of the third pair. The femur is nearly as long as all 

 the following joints together, broader below, and more than three times as long as it is 

 broad at the apex. The genu is broader than long. The tibia is more than twice as 

 long as the genu; the lower hind portion is produced, and tipped with a long, stout bristle. 

 The carpus is only a little dilated, with the margins smooth; the carpal process runs 

 in a straight line with the stem of the joint, and forms with the metacarpus a cheliform 

 hand ; the front side of the carpal process is quite half as long as the hind margin of the 

 metacarpus, and the margins are set with seven long bristles. The metacarpus is con- 

 siderably longer than the stem of the carpus, evenly tapering towards the apex, and more 

 than twice as long as it is broad at the base; the front margin has a single bristle just 

 below the middle; the hind margin is serrated as in the first pair. The dactylus is 

 curved, smooth, and half as long as the metacarpus. 



The third, and fourth pairs (PI. X, fig. 47). The upper portion of the femur is 

 strongly bent, and narrow, the lower part the broadest; it is considerably longer than the 

 three following joints together, and fully four times as long as it is broad at the base. 

 The genu is longer than broad. The tibia is longer than the genu, and tolerably broad; 

 the hind margin is straight, and smooth, with a long bristle at the lower corner and a 

 small spine above the middle. The carpus is scarcely longer than the tibia; the hind 

 margin is straight, with a long bristle in the middle and another at the lower corner. 

 The metacarpus is shorter than the two preceding joints together, but more than half 

 as long as the femur; the hind margin is not serrated but provided with four equidistant, 

 short spines. The dactylus is feebly curved, and more than half as long as the metacarpus. 



The fifth, sixth, and seventh pairs (Pi. X, fig. 48 — 51) are scarcely longer than the 

 two preceding pairs. The femur has the hind margin straight, and shows no narrow groove 

 for the reception of the following joints as usual, but the hind portion of the joint is de- 

 veloped into a thin lamina which overlaps and protects the following joints when they are 

 folded up. The femur of the fifth pair is much broader than in the two following 

 pairs, with the front margin strongly convex, and quite smooth; the front margin of 

 the joint in the two following pairs is feebly convex, and set with two spines. The genu 



