572 
PROFESSOR E. A. SCHAFER ON THE 
Fig. 6. Two nerves of the submuscular plexus bending towards and looping round 
one another. Drawn under a power of about 600 diameters. 
Fig. 7. A very dense interlacement of nerve-fibres situate between two of the nutri- 
tive tubes. Drawn under a power of about 100 diameters. 
Fig. 8. Central part and ends of a nerve-fibre from the submuscular plexus of Aurelia 
(osmic acid preparation). The fibre took a nearly straight course across 
the direction of the muscular fibres. The whole of the fibre is not given : 
it was about 3 millims. in length. 
a. End of fibre nearest polypite with motorial end-plate enlargement, p. 
b. Middle of fibre with bipolar ganglionic enlargement. 
c. End of fibre nearest to margin of umbrella. 
Drawn under a power of about 600 diameters. 
Fig. 9. Vertical section through the ectoderm covering the under surface of the 
umbrella of Chrysaora hyoscella. 
c. Ganglion- cell. 
e. Layer of epithelium-cells, 
m. Layer of muscular fibres. 
Drawn under a power of about 400 diameters. 
Fig. 10. Isolated cells of the nerve-epithelium of Aurelia aurita. 
A. Three of the long ciliated cells in conjunction. 
b. Thickened border. 
c. Cilia. 
f Fixed extremity branching into fine fibres. 
n. Nuclear dilatation. 
B. A single cell, similar to the foregoing. 
C D. Isolated cells from the pigmented patch on the intermediate 
portion of the lithocyst. 
h. Fine hair let. 
n. Nuclear dilatation. 
p. Enlarged free end of the cell loaded with brown pigment. 
v. Varicosities on central end of the cell. 
E. An otolithic cell with two adherent columnar cells. The ends of 
these, which are turned away from the otolith, are very delicate 
and branched. 
Figs. 11-16 represent a series of views (drawn under a magnifying power of 
about 600 diameters, but not to scale) of various parts of the same nerve-fibre, but 
only about half of the whole length of the fibre is represented. Any other fibres that 
happened to be visible in the same field of the microscope are also delineated. The 
clear margin around each fibre giving an appearance resembling a sheath is distinctly 
seen in all. In all the series the fibre is marked xx. The direction of the subjacent 
muscular fibres is in all parallel to the upper and lower margins of the paper, and is 
sketched in at one or two places. 
