162 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID^E. 



Hyper ia hystrix. 



notches; the sides of the joint are densely covered with spine-like bristles. The meta- 

 carpus is more slender than in the first pair, broad at the base, tapering, and densely 

 covered all over with short spine-like bristles; the front margin is nearly straight, and the 

 lower half of it is feebly notched; the hind margin is straight, and minutely serrated. The 

 dactylus is long, curved, not fully half as long as the metacarpus, and minutely serrated 

 on the hind margin. Glands as in the first pair. 



The third and fourth pairs (PL IX, fig. 27) are more slender than in the preceding- 

 species. The femur is elongate-ovate, and somewhat longer than the three following joints 

 together; the hind margin is set with seven or eight very short bristles, the lower corner 

 with about six short, spine-like bristles. The genu is longer than broad; the lower 

 hind corner is armed with short bristles, and one standing singly a little above. The tibia 

 is longer than the genu; the hind margin is fringed with a row of minute, teeth-like spines, 

 and has three short bristles along its lower half. The carpus is much longer than the 

 tibia; the hind margin is armed in the same way, but the number of short bristles is about 

 twelve; these bristles are much shorter than half the breadth of the joint. The meta- 

 carpus is much longer than the carpus, and only a little shorter than the tibia and carpus 

 together; it is more slender, and about half as broad as the carpus; the hind margin is 

 almost straight, minutely serrated and set with eight equidistant pairs of very short, spine- 

 like bristles. The dactylus is slightly curved, equalling in length a third of the meta- 

 carpus. Glands are most fully developed within the femur but are also present in the 

 four following joints. 



The fifth pair (PL IX, fig. 28) are fully as long as the two preceding pairs. The 

 femur is tolerably broad, quite as broad as that of the fourth pair; it is about as long as the 

 three following joints together; the front margin is smooth and slightly convex; the hind 

 margin is nearly straight. The genu is longer than broad, and is smooth. The tibia is much 

 longer than the genu; the front margin is set with some minute hairs or feeble bristles. 

 The carpus is somewhat longer than the tibia and considerably more slender; it is feebly 

 bent near the base; the front margin is densely fringed with a row of very minute, slender 

 bristles, and eight equidistant hairs, very short and curved. The metacarpus is a little longer 

 than the carpus, and more than half as long as the femur, but it is considerably shorter 

 than the metacarpus of the third and fourth pairs. The dactylus is slightly curved, 

 and fully as long as a fourth of the metacarpus. Glands as in the preceding pair. 



The sixth and seventh pairs (PL IX, fig. 29) are as long as the fifth pair, but a 

 little more robust. The tibia is as long as broad. The tibia and carpus are equal in 

 length, and armed as in the fifth pair; the carpus is more strongly bent at the base 

 than in the preceding pair. 



The pleon is quite as long as the peraeon; the lateral parts of the segments are very 

 deep, and rounded below; that of the first segment is broadly rounded at the hind corner; 

 the hind corners of the last two segments are sharp-pointed; the segments are subequal 

 in length. 



The pleopoda are very stout, the peduncle is thick, egg-shaped, and longer than the 

 rami. The coupling spines are thick, with tuberculous heads and three strongly curved 



