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



Euprimno niacropus. 



teeth oti its lower halt', the hitid margin is straight. Tlic ge nu is lunger than broad, 

 and has a low tooth on the front margin. The tibia is much loiigei- 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 ujargin is almost smooth. The meta- 

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

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

 metacarpus. 



The seventh pair (Pl. XVII, iig. 38 and 39) reach to tlie middle of the cai'pus in 

 the sixth pair. The femur is dilated, Avith the front margin concave and the u[)per 

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

 or slightly exca^ated; it is longer than all the foUowing 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 ear])us 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 eomb-like instrument, the lower portion of the front margin being densely set 

 with fine, sharp-pointed bristles, rectangnlarly to the front margin; the dactylus is raore 

 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, whicli is eonsiderably longer 

 in the adult aiiimal than in the )'oiingei'. The lateral parts of the tirst two segments are 

 squared behind nnd somewhat sliarp-pointed; that of the third segment is produced behind 

 and shar])-pointed. 



The pl<'opod(i decrease rapidh' in size from the tirst pair. Tlie outer ramus of the 

 lirst pair has twelve or fourteen joints, the inner ele\en or twelve. 



The ninis is eonsiderably shorter than the last pleonal segment. The lirst ural 

 segment is a, trifle shorter than, or as long as, the last coalesced one, ^v]^ich is more than 

 twice as broad as long. 



The uropoda (Pl. XVII, ^g. 40) are liable to great variation with the age of the 

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

 are dilated, about three tiines 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 tirst 

 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 irmer 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 tive 

 times as long as broad, and raore distinctly serrated. The third- j;aiV in the adult are 

 broadlj' 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 innei' is smootli. In the young they 



