Euphausiidæ. 37 



the two being the transformation in the latter stage of the 

 anterior part of the carapace, which allows the compound 

 eyes to be freely exposed laterally. I have very carefully 

 examined both this stage and the loug series of succeeding- 

 stages composing the larval development of Euphausiidæ; 

 but the description of these stages must be deferred to 

 auother occasion. 



