310 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID7E. 



Euthemisto cotnpressa. 



and indistinctly notched; the hind margin is convex, notched, and set with spines. The 

 tibia is a little longer than the genu, and has the lower front corner somewhat pro- 

 duced. The carpus in the adult male is irregularly triangular, with the upper part of 

 the hind margin strongly convex, pectinated, and armed with long bristles (PL XIII, tig. 

 35); the front margin is feebly convex; in the young the carpus is narrower and more 

 ovate. The metacarpus is stout, longer than the carpus, and has the hind margin finely 

 pectinated; along the side of the joint there runs a row of tufts of long hairs (PI. XIII, 

 fig. 36). The dactylus is almost half as long as the metacarpus. 



The fifth pair (PI. XIII, fig. 37 — 39) in the adult male are fully as long as the 

 head, perseon, and pleon together. The femur is comparatively narrow, fully three times 

 as long as broad; the front margin is only feebly convex, and fringed with spines; the 

 hind margin is straight, and notched, or coarsely serrated. The genu is broader than long. 

 The tibia is quite twice as long as the genu, with the lower hind corner produced into 

 a short process, which scarcely is half as long as the rest of the joint; the front margin 

 is fringed with spines. The carpus is longer than the femur and genu together, and is 

 about four times as long as broad; the front margin is almost straight, finely pectinated 

 (PI. XIII, fig. 38), and set with equidistant, spine-like bristles; the hind margin is feebly 

 convex, notched, and provided with a few short spines. The metacarpus in the adult 

 male is straight, slender, and as long as the three preceding joints and half the femur 

 together; the front margin is pectinated (PI. XIII, fig. 39), the spine-like teeth forming 

 the petination being directed a little downwards; the hind margin is smooth. The dac- 

 tylus is smooth, feebly curved, and about a twelfth part as long as the metacarpus. 



The sixth and seventh pairs (PI. XIII, fig. 40 — 42) are equal in length, and reach 

 in the adult animal scarcely beyond the apex of the carpus in the fifth pair. The femur 

 is narrow, three times as long as broad, and has the front margin a little convex and 

 armed with spine-like bristles; the hind margin is straight and notched. The tibia is 

 more than twice as long as the genu, with the lower hind corner produced into a tri- 

 angular, sharp-pointed process. The carpus is fully twice as long as the tibia, and is 

 a little broader in the sixth pair than in the seventh, with the front and hind margins 

 very feebly convex and armed with bristles; in the seventh pair (PI. XIII, fig. 41) the 

 front margin is feebly concave, notched, and set with long bristles, and the hind margin 

 is feebly convex, carrying two or three short, spine-like bristles. The metacarpus is 

 long and curved, in the adult male it is a little longer than the three preceding joints 

 together; the front margin is indistinctly pectinated, and set with long bristles (PI. XIII, 

 fig. 42). The dactylus is smooth and long, more than a fifth part as long as the 

 metacarpus. 



The pleon is almost as long as the whole peraeon, and strongly carinated; each seg- 

 ment shows an angular projection in the median line, which projection is largest in the 

 first segment; the lower hind corner of the segments is a little produced and sharp- 

 pointed; the under margin of the segments is feebly notched. 



The pleopoda are comparatively shorter than in Euthemisto libellula; the outer ramus 

 of the first pair has sixteen joints, the inner fifteen. 



