PRENTISS: THE OTOCYST OF DECAPOD CRUSTACEA. 2 
Or 
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EXPLANATION OF THE PLATES. 
All Figures were outlined with an Abbé camera lucida. Tube length was 
usually 160 mm., with projection distance to the table, 410 mm. The magnifi- 
cations are given with the descriptions of the several figures. Drawings were 
made from sections, unless the contrary is stated. The orientation of the figures 
is given for each plate. 
ABBREVIATIONS. 
el.gl. . . . Gland cell. nl. tu. 
cl.gn. . . . Ganglion cell. n. opt. 
cl.ma.. . . Matrix cell. n. ot. 
cont. cre’oes. | Cireumcesophageal con- n’pil. at.1 . 
nective. n’pil.at.2 . 
crs. sns. . . Sensory crista. n’pil. opt. . 
cla ee Cuticula: n. teq. 
ca’. . . . New cuticula. Ui. 
dite. uct: olcy. 
for’. . . . Fibrillations. ot lth. 
for.ass. . . Association nerve fibre. pinn. 
for.c. . . . Central nerve fibre. pre. pr’pl. 
for.n.. . . Nerve fibre. rm. l. 
for. pi’ph. . . Peripheral nerve fibre. 
ie o o 6 « llerllinyey ro. 
Gib eee (Globulus: Schau. 
gn. olf.. . . Olfactory ganglion. set. fil. . 
Wdrm. . . . Hypodermis. set. 1. 
lab.a. . . . Anterior lip of orifice set. m. 
to otocyst. set.olf. . 
iab.p. . . . Posterior lip of same. set. ot. 
lu. . . . . Lumen of otocyst. set. p. 
mal.. . . . Hammer. set.ta. . 
mb.sph. . . Spherical membrane. set. tac. 
n.at.1. . . Antennular nerve. tb. set. . 
nat.2@ . . . Nerve of 2d antenna. iso 6 
n’bl.. . . . Neuroblasts. tu. myl. 
nlem . . . Neurilemma. 
Sheath nucleus. 
Optic nerve. 
Otic nerve, 
Neuropil of antennule. 
Neuropil of antenna. 
Optic neuropil. 
Tegumentary nerve. 
Orifice. 
Otocyst. 
Otoliths. 
Pinnules of hairs. 
Protoplasmic process. 
Lateral branch of an- 
tennular nerve. 
Rostrum. 
Group hairs. 
Thread hairs. 
Laterai hairs. 
Median hairs. 
Olfactory hairs. 
Otic hairs. 
Posterior hairs. 
Hook hairs. 
Tactile hairs. 
Hair tube. 
Tectum of otocyst. 
Myelin sheath. 
