Pbbntiss. — Otocyst Crustacea. 



PLATE 6. 



Crangon ; in Figure 28 dorsal is up ; in Figure 29 anterior is up. 



Fig. 28. Transverse section of both antennules through the sensory cushions of 

 the otocysts. X 95. 



Fig. 29. Reconstruction from ten frontal sections through the base of both anten- 

 nules and the brain. A semi-diagrammatic nerve element is shown 

 at the left in black. X 95. 



