540 



I'UCH'EEDINdS OF THE NATIONAL MmEVM. 



vol.. XXVIII. 



I'x'liiiid this are two other suture.s indicated in the same manner and 

 al.so by ])ercepti))le groove.s in the body wall itself. There are also 

 traces of another joint farther back, very close to the balancers on 

 either side. The pigment, whicii is characteristic of the species, and 

 which at first was o-ather(Hl more or less in the regions indicated, now 

 spreads ah)no- tlu^ sides of the bod}^ while the two spots near the anus 

 fuse across the mid line. 



The condition of this pigment as to whether it is a continuous line or 

 a series of irregular spots varies greatly even in the same species; now 

 the one condition prevails, now the other. 



Fig. 39. — A naupi.ii's of Lefkoi'iithkikts edwardsi jrsT keahy to Mon/r into a metanauplius 

 The new appendages can be plainly seen at tue posterior end of the body. 



The ai)pendages remain unclian^ed, but ])etween their bases on the 

 ventral surface the huge shield-like labrum becomes more prominent. 

 The spines also near the tips of the endopods of the two })osterior 

 pairs of ap])endages af(> larger than before the molt, and they show- 

 up plainly in a ventral view (Hg. 88). 



Hitherto the lai'va has been \'ery acti\-e. but on getting ready for the 

 second moult it bect)nies more sluggish and moves al)Out slowly. It 

 also j)ays l(>ss attention to tln^ light and graduallv seeks the bottom of 



