272 CARL BOVALLTUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID^S. 



Parathemisto Goesi. 



broader than long, and is armed as in the first pair. The tibia is more than twice as 

 long as the genu; the lower hind part is produced to half the length of the stem of the 

 carpus, and is fringed with four or six longer and shorter bristles. The carpus is to- 

 lerably broad; the front margin has a long bristle at the apex; the hind margin is smooth; 

 the carpal process is short, and without terminal spine, but there are two long bristles 

 at the apex; the front side is not half as long as the hind margin of the metacarpus, 

 and has the margins smooth. The metacarpus is considerably longer than the stem of 

 the carpus, the front margin is feebly convex, and is provided with two short, spine-like 

 bristles; the hind margin is somewhat convex, is serrated on its lower half, and has a 

 bristle near the apex. The dactylus is almost straight, and finely serrated on the hind 

 margin; it is more than half as long as the metacarpus. 



The third and fourth pairs (PL XII, fig. 6) are similar in form and equal in length. 

 The femur is elongated, and is longer than that of the second pair. The genu is longer 

 than broad, with a short bristle near the lower hind corner. The tibia is not longer, 

 but much broader, than the genu, and has two short bristles on the hind margin. The 

 carpus is nearly ovate, the hind margin is armed Avith three or four long bristles, but 

 is not serrated. The metacarpus is comparatively thick, feebly curved, and finely 

 serrated on the hind margin; it is a little longer than the carpus. The dactylus is 

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



The fifth, sixth, and seventh pairs (PL XII, fig. 7 — 9) are similar in shape and 

 equal in length. The femur is quite as long as the three following joints together; that 

 in the fifth pair is a little broader than those in the sixth and seventh. The genu is 

 about as long as broad, with the lower hind corner somewhat produced. The tibia is 

 not fully twice as long as the genu, with the margins smooth. The carpus is as long 

 as the two preceding joints together, is linear, and has the margins smooth. The meta- 

 carpus is shorter than the two preceding joints together; the front margin is straight, 

 provided with five or six short bristles, and is finely pectinated; the hind margin is smooth. 

 The dactylus (PL XII, fig. 8) is feebly curved, smooth, and is about half as long as the 

 metacarpus; in the sixth and seventh pairs it is sometimes transformed into a spout- like 

 organ (PL XII, fig. 9). 



The pleon is only a little shorter than the whole perseon. The lateral parts of the 

 segments are almost straight below, and obtusely rounded behind. 



The pleopoda have the rami long and slender; the outer ramus of the first pair 

 has eight joints, the inner seven. The coupling spines are slender, hook-shaped, and 

 have two sharp teeth on the middle of the stem. The cleft bristle has the apically di- 

 lated arm much shorter than the other. 



The urus is quite as long as the last pleonal segment. The first ural segment is 

 about as long as the last coalesced, which is quite as long as it is broad at the base. 



The uropoda (PL XII, fig. 10). The first pair reach below the middle of the outer 

 ramus of the last pair; the peduncle is linear, five times as long as broad, and con- 

 siderably longer than the inner ramus, which is about a third part longer than the outer; 

 both rami are elongate and sharp-pointed; the inner ramus is serrated on the outer margin, 

 the outer ramus is serrated on the inner margin. The second pair reach a little below 



