134 



pubescent in the distal part.The outer lobe of the maxillipeds is armed in 

 the distal part of the inner margin with short setae, with somewhat larger 

 setae present on the distal angle of each lobe; between the apical and the 

 preceding setae there is a somewhat developed notch so that the outer 



1 15 seta seems as if attached to an independent prominence, which Woltereck 

 (1909) considered a rudimentary maxillary palp; the inner lobe is long, 

 deeply split, and a small apical seta is present on each lobe. 



In males pereopods I are strong; the 2nd segment is shorter than the 

 5th and 6th together; the linear or distaliy very weakly broadened 5th seg- 

 ment is equal to or slightly shorter than the oval-conical 6th segment; the 

 6th segment is armed with numerous setae, with especially strong ones 

 on the posterior margin; the distal part of the posterior margin, in addition 

 to setae, bears short blunt spines; the long, strong, slightly curved claw 

 is apically attached. In females pereopods I are much weaker though the 

 ratios of their segments are the same. Pereopods II are slightly longer 

 than pereopods I; in sexually mature males the 6th segment is equal to 

 or slighdy shorter than the 2nd segment, amygdaloid in shape, with a 

 notch in the distal part of the posterior margin locking in the strong 



116 curved claw; the distal part of the posterior margin of the segment bears 

 long setae and several short blunt spines. The notch in the distal part 

 may vary in development; sometimes it is only weakly developed and 

 sometimes in large sexually mature specimens markedly developed, in 

 which case the segment broadens distaliy. Such an extreme form was 

 described as a unique species, M. valdiviae. In young crustaceans and in 

 females the 6th segment is always amygdaloid; the notch in the distal 

 part of its posterior margin is developed to a lesser degree and the seg- 

 ment itself is relatively shorter. Pereopods III and IV are longer than the 

 preceding ones, the 2nd segment may be broadened, shorter than the 4th 

 and 5th segments together, or rarely equal to them; the 4th segment is 

 either shorter than the 5th or nearly equal to it; the thin 6th segment may 

 be shorter or slightly longer than the 5th; the variations in the length 

 proportions of these segments are not sex related; the linear or narrow 

 amygdaloid 6th segment is shorter than the 5th, and may be shorter or 

 longer than the 4th segment. Pereopods VI are slightly thinner than pere- 

 opods V; the 2nd, 4th, and 5th segments are usually linear although in 

 some specimens the 4th segment is markedly broadened distaliy while 

 the 5th is broadened in its middle part; the 6th segment is narrowly 

 oval; the 4th and 5th segments are roughly equal in length, or the 4th is 

 somewhat longer than the 5th but the 6th is shorter than each of them\ 

 although Woltereck (1909) illustrates on the total outline of the male an 



Mn the illustration provided by Behning (1939) pereopods VI and VII have been 

 confused. 



