MR. A: HANCOCK ON THE STRUCTURE AND HOMOLOGIES OF THE 
PLATE LV. 
528 
Fig. 1. Posterior portion of Doridopsis tuberculosa, laid open, the heart removed, and the interior of the 
renal chamber exposed to view: a, the so-called pericardium; a’ a’ a’, dorsal wall of ditto, 
turned back; a" a" o, portions of the floor of ditto; Û, ventricle turned forward ; d, pyriform 
vesicle; e, orifice of ditto, leading into pericardium ; 7’, orifice at the apex of the vesicle, leading 
into the renal chamber; jj, renal chamber laid open; j'j', dorsal wall of ditto, opened and 
reflected; o o, hepatic arteries ; p, orifices of small branches of the renal chamber, that penetrate 
the liver; رو‎ hepatico-branchial vein; 7, external orifice of the renal chamber; s, anal nipple ; 
t, intestine; u u, liver; v, skin of the animal; w, branchial plumes. 
Fig. 2. View of the renal chamber of Doridopsis clavulata, laid open: d, pyriform vesicle, with a little of 
the pericardial floor attached to the broad extremity ; e, orifice of ditto, leading into the peri- 
cardium; i', orifice at the apex of ditto, leading into the renal chamber; jj, renal chamber; 
j'j', dorsal wall of ditto, reflected; o, hepatic artery ; p, orifices of small branches of the renal 
chamber, penetrating the liver; g, hepatico-branchial vein; 7, external orifice of the renal 
chamber. 
. 3. Pyriform vesicle of Doridopsis gemmacea, laid open to show the laminated plicz: e, orifice com- 
municating with the pericardium ; û', orifice at the apex of the vesicle, opening into the renal 
chamber ; f, laminated plice. 
Fig. 4. A few of the cilia, much enlarged, from the laminated plicz of Tritonia Hombergii: v, ovate 
granular vesicle at the base of the cilium ; w, several of the cilia adhering together; x, surface 
of attachment. 
. 5. Lateral view of the viscera of Plocamophorus Ceylonicus, exhibiting the renal organ in its natural 
position: a", floor of the pericardium, turned to one side; 5, ventricle seen through ditto, 
giving off aorta and hepatic artery ; c, auricle; d, pyriform vesicle attached to the floor of the 
pericardium, through which it opens; j, renal chamber reduced to a cecal tube; r, external 
orifice of ditto; 7’, tube leading from ditto to the renal chamber; q, hepatico-branchial vein 
laid open, showing three large orifices leading into the branchial plumes; s, anus; 7, intestine ; 
u u, the two lobes of the liver; v, first stomach; w, buccal organ; #, salivary gland; y, repro- 
ductive organs; z, cerebral ganglia. 
PLATE LVI. 
Fig 
Fig. 1. View of the posterior portion of Hexabranchus gloriosus*, the dorsal skin removed, and the peri- 
cardium laid open: a’ a’ a’, dorsal wall of pericardium, turned back; a" a", floor of ditto, laid 
open to show the renal chamber; 5, ventricle turned forward, with a portion of the auricle 
attached; c c c, portions of the auricle; d, pyriform vesicle; e, orifice of ditto, leading into 
the pericardium ; j, renal chamber ; q, hepatico-branchial vein; r, external orifice of the renal 
renk $, anal nipple; 4 u, liver; v, branchial plumes; w, margin of the foot; y y; dorsal 
skin. z 
Fig. 2. Dorsal view of the liver-mass of the same, the pericardium entirely removed, and the renal 
chamber laid open: 5, ventricle, turned forward ; d, pyriform vesicle, with a shred of the peri- 
cardial floor adhering to the broad extremity ; e, orifice of the vesicle leading into the pericar- 
dium ; A, tubular prolongation of ditto ; i, orifice at the extremity of the prolongation ; jJ, ren 
chamber, laid open; j" j’, dorsal wall of ditto, turned back; 7, 7, openings of lateral branches 
that follow the principal arteries ramifying over the liver; n, aorta; o 0, hepatic arteries ; 
D p, openings of small branches of the renal chamber that penetrate the liver; 4, hepatico- 
* Doris gloriosa, Kelaart. 
