PRENTIss. —- 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 965. 
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 985. 
