PRENTISS. — Otocyst Crustacea. 
PGA El. 
Figures 30 and 31 are of Crangon. All others are of Cambarus. In Figure 30 
dorsal is up and lateral is at the left ; in Figure 36 dorsal is up and lateral is at the 
right. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
30. 
él. 
32. 
33. 
Parasagittal section of antennule and brain. x 95. 
Otocyst hair. X 600. 
Olfactory hairs from basipod of second maxilla, showing innervation. 
Methylen blue. X 95. 
Posterior row of otocyst hairs and their nerve elements. Methylen 
blue. X 95. 
Tactile hair from scaphognathite of second maxilla, showing innervation. 
Methylen blue. X 95. 
Transverse section through shaft of otocyst hair. X 770. 
Diagrammatic transverse section of the right antennule through the pos- 
terior part of the otocyst. X 16. 
