172 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I, 2. HYPERIIDJE. 



Hyperia Latreillei. 



The epimerals of the first and five following pairs of peraeppoda are somewhat 

 longer than the under margins of the corresponding segments; that of the seventh pair 

 is a little shorter. They are all longer than deep, and rounded below. 



The branchial sacks are fixed to the second and four following pairs of perieopoda; 

 they are a little shorter than the femora of the corresponding legs. 



The first pair of perceopoda (PL X, fig. 4 — 6). The femur is almost as long as the 

 four following joints together; the hind margin is feebly convex, having the lower corner 

 fringed with long bristles; the front margin is convex. The genu is somewhat broader than 

 long; the lower hind corner is fringed with long bristles. The tibia is longer than the 

 genu; the hind portion is produced downwards, spoon-shaped, and the margins are fringed 

 with long bristles. The carpus is as long as the two preceding joints together, di- 

 lated, and faintly produced at the lower hind corner; the front margin is straight, the 

 lower corner is set with five or six long bristles, and two shorter ones are placed on the front 

 margin a little above; the hind margin is irregularly convex, with three distinct notches 

 below T the middle, from each of which rises a long bristle; a few bristles are fixed on the 

 sides of the joint; the under margins of the joint are a little convex, and fringed with long- 

 bristles. The metacarpus is shorter than the carpus, feebly tapering towards the apex, and 

 scarcely more than twice as long as broad ; the front margin is strongly convex, the lower 

 half being set with four or five bristles; the hind margin is almost straight, and strongly 

 serrated, the teeth being irregularly denticulated at their bases, but not regularly three- 

 pointed as in Hyperia galba; a few bristles are to be seen on the sides of the joint and 

 some are fixed near to the hind margin, but none into its edge or notching it and 

 interrupting the serration as in Hyperia spinigera. The dactylus (PI. X, fig. 5) is 

 long, curved, and serrated along the upper half of the hind margin; it is much longer 

 than the breadth of the metacarpus, and more than half as long as its length. Glands 

 are richly developed within the femur, running through the other joints to the base of 

 the dactylus. 



The second pair (PI. X, fig. 7 and 8) are a little longer than the first, and do not 

 fully reach to the middle of the metacarpus of the third pair. The femur is a little 

 broader and longer than that in the first pair and fully as long as the four following joints 

 together; the front margin is somewhat more convex than the hind margin, the lower 

 corner of which is set with long bristles. The genu is broader than long, the lower hind 

 corner being fringed with long bristles. The tibia is twice as long as the genu; the 

 lower hind portion is produced as in the first pair, and fringed with long bristles. The 

 carpus is fully as long as the two preceding joints together, dilated and produced; 

 the front margin is straight, the lower corner being provided with long bristles; the hind 

 margin is almost straight or rather a little excavated, without bristles; the front side of 

 the carpal process is broadly spoon-shaped, and not half as long as the hind margin 

 of the metacarpus; the margins are fringed with long bristles. The metacarpus is as 

 long as the carpus without the carpal process, feebly tapering, and somewhat more than 

 twice as long as broad; the front margin is convex, and provided with a few bristles 

 below the middle; the hind margin is almost straight, and armed as in the first pair. 



