206 MR. A. HANCOCK ON THE ANATOMY OF DORIDOPSIS. 
e, ventricle; f, auricle; g, one of the great lateral pallial veins ; A h, branchio-cardiae channels. 
i, pyriform vesicle, seen through the floor of the pericardium ; J, orifice of ditto, leading into the 
pericardium. 
PLATE XVIII. 
Fig. 1. Anterior portion of the alimentary tube of D. gemmacea, with the sac or sheath of the proboseis 
laid open: a, anterior margin of the animal; 4, sac or sheath of the proboscis, with the dorsal 
wall removed; c, oral orifice; d, anterior extremity of the proboscis; e, orifice of ditto ; A; pos- 
terior wall of the sheath; g g, retractor muscles of ditto ; A, delicate muscular bands to regulate 
the movements of the proboscis ; i, anterior portion of the proboscis; j, posterior or enlarged 
portion of ditto; k, two glands, opening into the anterior extremity of ditto; Z, duct of the 
glands; m, enlargement of ditto. 
Fig. 2. Reproductive organs, with the parts spread out: a, internal margin of the general external orifice; 
b, retracted penis; c, attenuated or outer portion of the vas deferens; d, enlarged or inner 
portion of ditto; e, female channel; J; small gland in connexion with ditto; g, mucous gland; 
h, oviduct; i, enlarged portion of ditto; 7, constricted portion, communicating with the vas 
deferens; k, continuation of the oviduct, sinking into the mucous gland ; Z, vaginal channel, 
leading to the spermatheca ; m, spermatheca; n, tube connecting ditto with accessory sperma- 
theca ; o, accessory spermatheca ; P, tube from ditto, penetrating the mucous gland. 
Fig. 3. Reproductive organs of D. nigra: a, retracted penis; 5, attenuated or outer portion of vas de- 
ferens; c, enlarged or inner portion of ditto; d, constricted tube, connecting ditto with the 
oviduct; e, female channel ; J; small gland in connexion with ditto; gg, mucous gland; #, ovi- 
duct; i, enlargement of ditto ; J, constricted portion of ditto ; k, continuation of ditto after its 
union with the vas deferens ; I, extremity of ditto, sinking into the mucous gland; m, vaginal 
tube; n, spermatheca; o, tube connecting ditto with accessory spermatheca, p ; g, enlargement 
of this tube; 7, tube from accessory spermatheca, sinking into mucous gland. 
Fig. 4. Male and androgynous apertures of D. gemmacea, exposed to view: a, vas deferens; 5, male 
aperture ; c, extremity of penis; d, vaginal tube; e, orifice leading into ditto. 
Fig. 5. Diagram of the branchial circulation: a, ventricle of the heart, dilated; 5, auricle of ditto; c, root 
of the aorta; dd, great lateral pallial veins; e, hepatico-branchial vein, passing below the 
heart ; f, afferent branchial channel; ggg, branchial arteries, running up the inner or upper 
surface of the plumes ; 7 ^, branchial veins, running down the outer or under surface of ditto; 
?, artery and vein of a branchial leaflet; k, efferent branchial channel; Z}, branchio-cardiac 
channels; m, anal nipple. 
PLATE XIX. 
Fig. 1. Ovary óf Goniodoris nodosa: a, liver; b, @sophagus; c, oviduct; dd, male ramifications 0! 
sacculi; ee, female sacculi. 
Figs. ? & 3. Under and upper views of terminal lobes of the same ovary, more highly magnified: d; = 
ramifications or sacculi; ee, female sacculi. 
(The letters of these figures, as far as they are applicable, indicate the same parts in all F 
figures of this plate.) 
Fig. 4. An ultimate lobule of the ovary of Doris tuberculata. 
Fig. 5. Three ultimate lobules of the ovary of Polycera ocellata. rd 
Fig. 6. A portion of the upper surface of the ovary of Triopa claviger, considerably magnified. 
Fig. 7. A portion of the under surface of the same ovary. | 
Fig. 8. Side view of ditto, — 
