Fig. 9. 
MR. A. HANCOCK ON THE ANATOMY OF DORIDOPSIS. 207 
An ovarian mass or lobule of Scyllæa pelagica, cut through the centre, to show the internal 
structure. 
Fig. 10. Ultimate lobule of the ovary of Bornella digitata. 
Fig. 11. Ovarian lobule of Eolis papillosa, seen in section. 
Fig. 12. A few of the sacculi of ditto, more highly magnified. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 7. 
Fig. 8. 
PLATE XX. 
Anterior portion of the proboscis of D. nigra laid open: a, thickened margin of the proboscis; 
b,c, anterior and posterior portions of ditto, showing the three longitudinal areas of the in- 
terior; d, esophagus or anterior stomach; e, corrugations of the internal surface of ditto; 
f, salivary glands; g, two glands opening into the extremity of the proboscis; A, duct of 
ditto; i, orifice of duct. 
Anterior portion of the alimentary tube, turned forward, so as to show its under surface: a, an- 
terior portion of the proboscis; 4, posterior portion of ditto; c, esophagus or anterior stomach ; 
d, salivary glands; e, buccal ganglia ; «f f, csophageal or par vagum nerves; g, two glands 
opening into the anterior extremity of the proboscis; h, duct of ditto; i, anterior extremity 
of aorta. 
View of the anterior portion of the foot and head of D. gemmacea: a, pallial margin; 5, foot ; 
c, thickened anterior margin of ditto; d, smooth area immediately behind the margin; e, head, 
with lateral tentacular points; f, oral aperture. 
View of the anterior portion of the foot and head of D. rubra: a, foot; b, thickened anterior 
margin of ditto; c, smooth area of ditto; d, lobes at the sides of the head; e, oral aperture. 
Dorsal view of the cerebral ganglia of D. gemmacea: aa, cerebroid ganglia; 55, branchial 
ditto; c, pedal ditto; d, olfactory ditto; e, olfactory nerves; ‚ff, three nerves distributed to 
the anterior part of the oral apparatus; g g, pallial nerves; A, nerves supplying the skin at 
the sides of the body; i, pedal nerves; j, commissure uniting the branchial ganglia; A, a mi- 
nute ganglion, apparently the homologue of the visceral in Doris; l commissure connecting 
the buccal to the cerebroid ganglia; m, buccal ganglia; n, esophageal nerves; p, eyes. 
- Cerebral ganglia of D. nigra: a, cerebroid; b, branchial; c, pedal; d, olfactory; e, olfactory 
nerves ; f, nerves supplying the anterior part of the oral apparatus; g, pallial nerves; A, pedal 
ditto; i, commissure uniting the pedal ganglia; j, ditto uniting the branchial; k, ditto uniting 
the buccal to the cerebroids ; J, eyes. 
View of the under surface of the same ganglia, the collar having been opened, - p T p 
ganglia turned to one side: a, cerebroid; 5, branchial; c, pedal; d, commissure uniting the 
cerebroid across the median line; e, ditto uniting ditto to the —ÁÀÁ——À 
to the pedal; y, ditto uniting the branchial to the pedal; A, ditto uniting the pedal below tbe 
proboscis; i, ditto uniting the branchial; jJ, ditto uniting the buccal to the cerebroid. 
Eye of D. gemmacea, much enlarged: a, black-pigment cup; 4, lens; c, cornea. 
