250 
MESSRS. HANCOCK AND EMBLETON ON THE ANATOMY OF DORIS. 
supplying' anterior portions of mantle ; 10, nerves to posterior portions of 
same, sending- a branch of communication ; 10', to branchial ganglia of the 
sympathetic system; 11 and 12, nerves to side of body; 13, 14 and 15, to 
foot; 16 and 17, nerves to buccal mass; 18, to tongue; 19, to salivary 
glands ; 20, to top of oesophagus; 21, nerves passing down that tube and 
united to two large ganglia of sympathetic system of stomach ; g, h, i,j, four 
nerves arising from visceral ganglion which is attached to lower surface ot 
branchial ; these go to be united with ganglia of the sympathetic system of 
the various organs ; k, first or anterior collar ; /, middle or second collar 
or commissure uniting the supra- and infra-oesophageal ganglia ; m, the 
third or posterior or great oesophageal collar. 
Fig. 9. Transparent capsule of supra-oesophageal ganglia, D. tuherculata, exhibiting 
from below the perforated septa dividing them, a, a, cerebroid ganglia; 
h, h, branchial ; c, c, pedial ; d, visceral ; e, e, the extremities of the great 
oesophageal collar. 
Fig. 10. Eye, D. repanda, a, optic ganglion; b, optic nerve; c, choroid; d, lens; 
e, cornea ; f, general capsule. 
Fig. 11. Auditory capsule, D. aspera. a, outer capsule; h, inner capsule containing 
numerous otolithes. 
Fig. 12. Two otolithes highly magnified showing central nucleus. 
PLATE XVII. 
Fig. 1. View of under surface of cerebral ganglia showing their connections with the 
sympathetic system, D. tuherculata. a, a, cerebroid ; 6, b, branchial ; 
c, c, pedial ; d, olfaetory ; e, buccal ; f, gastro-oesophageal ; visceral ; 
g, anterior or first nerve from visceral ganglion giving twigs to aorta, to 
ganglia at apex of ventricle, to pericardium, to portal heart, to renal plexus, 
and terminating in a ganglion of branchial plexus ; h, second nerve from 
visceral ganglion terminating in principal ganglion of genital plexus; 
i, third nerve from visceral ganglion giving branches to a plexus on female 
generative organs, and ending in the chief ganglion of gastro-hepatic 
plexus ; j, fourth or last nerve from visceral ganglion passing to lower 
portion of intestine, to which it gives branches, most probably, to the 
ganglia thereon, and terminates in a ganglion of branchial plexus ; k, first 
or anterior collar of cerebral system ; /, second or middle ditto ; m, third 
or great oesophageal ditto; 18, lingual nerves; 19, nerves to salivary 
glands; 20, to upper portion of oesophagus; 21, nerves (par vagum) 
passing down oesophagus, united with the plexus thereon, and terminating 
in two of the principal ganglia of gastro-hepatic plexus ; 22, nerves in 
connection with ganglia and nerves on buccal mass; w, minute ganglion 
