24 BULLETIN OF THE LABORATORIES 



Fig. II. Larva of Limnetes when .5 mm. long, showing withdrawal of the 

 hypoderm and its contents from the walls of the antennules and labrum. A^ an- 

 tennules inside the sheath formed by their old covering. Z, labrum inside its old 

 shell, L\. 



Plate X. 



Fig. I. Head of Chirocephahis, male, nearly adult. 



Fig. 2. A typical foot of the same. 



Fig. 3. One of the swimming feet of Limnetes. 



Fig. 4. Outline of the head of Limnetes, after the metamorphosis, showing 

 relation of labrum and antennules and also the position of the beak, eye and sen- 

 sory fleck. 



