Peentiss. — Otocyst Crustacea. 



PLATE 2. 



All Figures are of Palcemonetes. The dorsal side is up in Figure 5, and the an- 

 terior end at the right. 



Fig. 5. Parasagittal section through the lateral side of the right otocyst (see line 

 5, Fig. 1). X Hi. 



Fig. 6. Transverse section through the posterior end of the sensory cushion, 

 showing two lateral hairs, the base of a median one and a group of 

 gangUon cells. X 168 



Fig. 7. Otocyst hair and matrix cells. X 600. 



Fig. 7a- Another otocyst hair and matrix cells. X 600. 



Fig. 8. Sensory hair of the otoc.vst and the ending of its peripheral nerve fibre. 

 X 600. 



Fig. 9. Fundament of developing sensory hair from an abdominal exopod, 

 showing matrix cells about tiie nerve fibre. Methylen-blue prepara- 

 tion. X 600. 



