MESSRS. Hi^NCOCK AND EMBLETON ON THE ANATOMY OF DORIS. 251 
on aorta ; o, ditto on a branch from same ; p, two ganglia at apex of ven- 
tricle; q, branchial plexus connected by branches with nerve 10 from 
branchial ganglia; r, principal ganglion of genital plexus; s, plexus of 
female organs ; t, principal ganglion of gastro-hepatic plexus ; u, pyloric ; 
V, renal ; iv, w, intestinal plexus ; a, retracted penis ; (3, testis ; y, mucus- 
gland ; Stomach ; £, hepatic duct ; pancreas ; oesophagus ; 9, intestine ; 
(, anus. 
Fig. 2. Cerebral ganglia, D. Johnstom, seen from above, a, cerebroid, supporting 
optic ganglia and auditory capsules; h, b, branchial ganglia; c, c, pedial; 
d, olfactory ; e, buccal ; f, gastro-oesophageal ; 1, nerves to dorsal tentacles ; 
2 and 3, to lips and channel of mouth ; 4, 5 and 6, to mantle ; 7, 8 and 9, 
supply the foot ; 10, 1 1 and 12, visceral nerves ; 13, pass down oesophagus ; 
14, supply salivary glands; 15, nerves to top of oesophagus, 16, to tongue. 
Fig. 3. Under view of one side of cerebral ganglia, D. Johnstom. a, cerebroid ; 
h, branchial ; c, pedial ; e, visceral, giving off visceral nerves, 10, 11, 12. 
Fig. 4. Dorsal view of cerebral ganglia, D. verrucosa, giving off nerves in the usual 
manner. «, a, cerebroid 6, branchial ; c, pedial; </, olfactory ; e, buccal; 
f, gastro-oesophageal. 
Fig. 5. Pancreas laid open, D. tuherculata, to show transverse laminse. 
Fig. 6. Dorsal view of cerebral ganglia, D. hilamellata. a, a, cerebroid; h, b, branchial ; 
c, c, pedial ; d, olfactory ; e, buccal ; f, gastro-oesophageal ; g, optic ; 1, 2, 3, 
visceral nerves. 
Fig. / . Under view of same ganglia, a, a, cerebroid; b, b, branchial ; c, c, pedial; 
d, olfactory; e, visceral, giving off three visceral nerves. 
Fig. 8. Dorsal view of cerebral ganglia, D. pilosa. a, a, cerebroid ; b, b, branchial ; 
c, c, pedial ; 1,2, visceral nerves. 
Fig. 9. Dorsal view of cerebral ganglia, D. repanda : these ganglia are arranged as in 
the last species ; 1, 2, visceral nerves ; 2 exhibits a ganglionic swelling. 
PLATE XVIII. 
Fig. 1. View of cardiac or posterior portion of stomach, D. tuberculata, showing 
gastro-hepatic plexus, and collar or chain of ganglia of sympathetic nervous 
system, a, oesophagus; b, hepatic duct; c, pancreas; d, d, nerves of par 
vagum ; e, third nerve (i) from visceral ganglion ; f, f, great chain or 
collar of ganglia ; g, principal ganglion of same ; h, h, two of the principal 
nerves of gastric plexus connecting gastro-hepatic with pyloric plexus. 
Fig. 2. Pyloric extremity of stomach, and small portion of intestine displaying part of 
pyloric and intestinal plexuses of sympathetic system, a, a, pyloric plexus ; 
h, commencement of intestinal ditto. 
