PRENTIss. — Otocyst Crustacea. 
PLATE 2. 
All Figures are of Palemonetes. 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 
Seip) ae OA: 
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 
ganglion cells. X 168 
Fig. 7. Otocyst hair and matrix cells. 600. 
Fig. 7a. Another otocyst hair and matrix cells. X 600. 
Fig. 8. Sensory hair of the otocyst 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 the nerve fibre. Methylen-blue prepara- 
tion. X 600. 
