Prentiss — Otocyst Crustacea. 



PLATE 3. 



All Figures are from raethylen-blue preparations of Pakemonetes. Anterior is 

 up on plate in Figure 12. 



Fig. 10. Part of abdominal exopod showing tubes of developing tactile hairs and 

 their innervation. X 125. 



Fig. 11. Peripheral nerve endings in the tactile hairs of the second maxilliped. 

 X 95. 



Fig. 12. Dorsal view of antennules and brain, showing sensory neurons and cen- 

 tral endings of the otocyst nerve fibres. The peripheral endings in 

 the left otocyst are diagrammatic. X 30. 



