INNERVATION OF CERATA OF SOME NUDIBRANOHIATA. 557 
Fic. 6.—Part of section (No. 113), six further back, showing the origin 
of the epipodial nerve (ep. z.) from the dorsal edge of the pleural ganglion. 
The cerebrals are not present so far back. x 300. 
Fic. 7.—Part of similar section of another specimen (section No. 96), 
showing the origin of the epipodial nerve on each side, from dorsal edge of 
pleural ganglion immediately behind the cerebral, a small piece of the posterior 
end of the cerebral ganglion being present on the left side. x 300. 
Fic. 8.—Upper half of transverse section (No. 231 of same series as Figs. 
4, 5, and 6) in the region of the first pair of cerata, showing the main 
epipodial nerve in the body-cavity, its first branch in the dorso-lateral body- 
wall, and twigs going up from that into the ceras on the right side. x 50. 
Fic. 9.—Diagram of Ancula cristata, from the left side, showing the 
origin aud distribution of the epipodial nerves. 
PLATE XXXIII. 
Fic. 10.—Part of a transverse section of Tergipes despectus, showing 
the origin of the epipodial nerve from the dorsal surface of the pedal gan- 
glion. x 300. 
Fie. 11.—Part of the next section, showing the epipodial nerve lying under 
part of the stomach-wall where it runs outwards from the pedal towards the 
pleural ganglion. x 300. 
Fie. 12.—Part of the next section, showing the epipodial nerve lying in 
contact with the pleural ganglion. x 300. 
Fie, 13.—Adjoining section, showing epipodial nerve passing from close to 
pleural ganglion to inner surface of body-wall, so as to pass up to ceras 
above. xX 300. 
Fie. 14.—Next section (54th from anterior end), showing nerve passing up 
dorsally between stomach and body-wall. x 300. 
Fies. 15 and 16.—Neighbouring sections to last, showing branches of nerve 
passing up to ceras. X 300. 
Fic. 17.—Transverse section of the whole body of Tergipes despectus 
behind the middle, to show the relative sizes of cerata and body, and the 
junction of hepatic ceca with liver in body. x 50. 
Fic. 18.—Part of the ovo-testis in same region of body as last section, 
showing both ova and spermatozoa in various stages. x 300. 
Fic. 19.—The tip of one of the cerata in the same region, showing the 
communication between the hepatic cecum and the cnidophorous sac. x 300. 
Fie. 20.—Transverse section of Hermea dendritica, near the anterior 
end (Section 61st of the series), showing the relations of the cerata to the 
body, and the cerebro-pedal and buccal ganglia surrounding the cesophagus. 
x 300. 
Fie. 21.—Part of the second section, further on, showing the origin of the 
epipodial nerve from the ventral part of the cerebro-pleural ganglion. x 300. 
