550 WwW. A. HERDMAN AND J. A. CLUBB. 
top of the esophagus, and the dorsal surface of the base of the 
cerata, the nerve splits into two branches, a dorsal and a ven- 
tral (fig. 24, ep. m.), which proceed outwards into the cerata 
respectively above and below the lobes of the ovo-testis. 
The otocyst lies between the pleural and the pedal ganglia, 
just underneath and internal to the origin of the epipodial 
nerve (fig. 21, 0.c.). 
Fig. 20, besides giving the general relations of nervous system, 
body, and cerata, shows the enormous number of glands (fig. 20; 
gl.) embedded in the anterior part of the foot. 
TERGIPES. 
Fig. 17 on Pl. XXXIII gives a transverse section of 
Tergipes despectus to show the relative sizes and positions 
of the few large cerata and the small body. It isalittle behind 
the middle of the body, posterior to the stomach and nervous 
system, and the greater part of the cavity of the body is 
occupied by the very large lobes of the ovo-testis. 
The only nerves which we find going to the cerata in this 
species arise from the pedal ganglia. Fig. 10 (Pl. XXXIIT) 
shows part of a section in which the pedal ganglia connected by 
their commissure lie under the cesophagus ; the cerebrals are no 
longer visible, they are in sections further forward. The epi- 
podial nerve is seen on the left side arising from the dorsal 
surface of the pedal ganglion, and running outwards under a 
part of the stomach which occurs here. The next two sections 
(figs. 11 and 12) show the nerve passing outwards to enter into 
close relations with the pleural ganglion of that side, from 
which, however, it remains perfectly distinct. On reaching 
the lateral body-wall the nerve turns upwards and runs dorsally 
(Pl. XX XIII, figs. 138 and 14) between the stomach and the 
body-wall towards the base of one of the cerata (Pl. XX XIII, 
figs. 15 and 16), to which it gives off a branch and then passes 
on backwards in a dorso-lateral position. 
These sections of Tergipes despectus show well some 
other points in structure. The lobes of the ovo-testis (figs. 17 
