PRENTIss. — Otocyst Crustacea, 
PLATE 1. 
All Figures are of Palemonetes. In Figure 1 anterior is up on the plate ; 
in Figures 2, 8, and 4 the dorsal side is up, and the anterior end in Figure 4 is at 
the left. 
Lines numbered 2, 3, 4, 5 in Figure 1 indicate the planes of the sections 
shown in Figures 2, 3, 4, and 5 respectively. 
Fig. 
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Dorsal view of the basal segment of both antennules, showing otocysts 
and the arrangement of the hairs in the sac. X 30. 
Somewhat oblique transverse section, extending from dorsal anterior to 
ventral posterior, of both antennules and the rostrum, through the 
posterior ends of the otocysts (compare line 2, Fig. 1). X 64. 
Transverse section of right antennule through the orifice of the sac, show- 
ing tectum and otoliths (compare line 3, Fig. 1). 64. 
Parasagittal section through right antennule and brain, showing the 
course of the otic nerve, with a single nerve element drawn diagram- 
matically (see line 4, Fig. 1). X 64. 
