406 CARL BOVALLIDS, AMPHIPODA HYPERIIDEA. I. 2. ANCHYLOMERID^. 



Euprim.no macropus. 



teeth on its lower half, the hind margin is straight. The genu is longer than broad, 

 and has a low tooth on the front margin. The tibia is much longer than the genu, 

 with the lower front and hind corners produced into long, sharp-pointed processes; 

 on the front margin there are two low teeth. The carpus is longer than the tibia, 

 the front margin is provided with three large teeth and three minute ones, the lower 

 corner is produced and sharp-pointed, the hind margin is almost smooth. The meta- 

 carpus is fully as long as the carpus, slender, and has the front margin finely 

 serrated, and the hind margin smooth. The dactylus is not a third part as long as the 

 metacarpus. 



The seventh pair (PI. XVII, fig. 38 and 39) reach to the middle of the carpus in 

 the sixth pair. The femur is dilated, with the front margin concave and the upper 

 half of the hind margin strongly convex, the lower half of the hind margin is straight 

 or slightly excavated; it is longer than all the following joints together, and is as long 

 as the femur in the sixth pair. The genu is as long as broad. The tibia is longer 

 than the genu. The carpus is about as long as the two preceding joints together. The 

 metacarpus is longer and narrower than the carpus. The dactylus is transformed 

 into a comb-like instrument, the lower portion of the front margin being densely set 

 with fine, sharp-pointed bristles, rectangularly to the front margin; the dactylus is more 

 than half as long as the metacarpus. 



The pleon is large and deep. The first two segments are each produced dorsally 

 in the median line into a long and sharp-pointed process, which is considerably longer 

 in the adult animal than in the younger. The lateral parts of the first two segments are 

 squared behind and somewhat sharp-pointed; that of the third segment is produced behind 

 and sharp-pointed. 



The pleopoda decrease rapidlj 7 in size from the first pair. The outer ramus of the 

 first pair has twelve or fourteen joints, the inner eleven or twelve. 



The urus is considerably shorter than the last pleonal segment. The first ural 

 segment is a trifle shorter than, or as long as, the last coalesced one, which is more than 

 twice as broad as long. 



The uropoda (PI. XVII, fig. 40) are liable to great variation with the age of the 

 animals. In the adult male the first pair reach beyond the middle of the third pair, 

 are dilated, about three times as long as broad, and sharp-pointed at the apex, the lower 

 half of the outer margin is finely serrated, and the apical portion of the inner margin 

 is slightly serrated. In the very young male the first pair are narrow, almost styliform, 

 about ten times as long as broad, and sharply serrated on both margins. The second pair 

 in the adult do not reach to the apex of the third pair but reach to that of the first 

 pair, are broadly laminar, nearly half as broad as long, with the outer margin coarsely 

 serrated with low, indistinct teeth, and the apical portion of the inner or under margin 

 minutely serrated; the apex is sharp-pointed, or the hind portion is emarginate and pro- 

 vided with three teeth. In the young the second pair are much narrower, four or five 

 times as long as broad, and more distinctly serrated. The third pair in the adult are 

 broadly laminar, more than half as broad as long, and more or less rounded behind; the 

 outer margin is serrated as in the second pair, the inner is smooth. In the young they 



