Prentiss. — Otocyst Crustacea. 



PLATE 7. 



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. 30. Parasagittal section of antennule and brain. X 95. 



Fig. 31. Otocyst hair. X 600. 



Fig. 32. Olfactory hairs from basipod of second maxilla, showing innervation. 

 Methylen blue. X 95. 



Fig. 33. Posterior row of otocyst hairs and their nerve elements. Methylen 

 blue. X 95. 



Fig. 34. Tactile hair from scaphognathite of second maxilla, showing innervation. 

 Methylen blue. X 95. 



Fig. 35. Transverse section through shaft of otocyst hair. X 770. 



Fig. 36. Diagrammatic transverse .section of the right antennule through the pos- 

 terior part of the otocyst. X 15. 



