5-10 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOI,. XX VIII. 



Behind this are two other sutures indicated in the same manner and 

 also by perceptible grooves in the body wall itself. There are also 

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

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

 which at first was gathered more or less in the regions indicated, now 

 spreads along the sides of the body, 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 nauplius of Lepeophtheirus edwardsi' just eeady to moult into a metanauplius 

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



The appendages remain unchanged, but between 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 posterior 

 pairs of appendages are larger than before the molt, and they show 

 up plainly in a ventral view (fig. 38). 



Hitherto the larva has been very active, but on getting ready for the 

 second moult it becomes more sluggish and moves about slowly. It 

 also pays less attention to the light and gradually seeks the bottom of 



