204 MR. A. HANCOCK ON THE ANATOMY OF DORIDOPSIS. 
delieate suctorial proboscis. This modification is so remarkable, that, taken in con. 
junction with the deficiency of spicula in the mantle, we have thought it sufficient to 
justify us in establishing a new family for the reception of all the Doris-like animals 
so characterized. "Thus Doridopsidæ now makes the third family in the suborder 
Acanthobranchiata, 
EXPLANATION OF THE PLATES. 
PLATE XV. 
Fig. 1. Dorsal view of the viscera, undisturbed, of Doridopsis gemmacea: a, dorsal skin of the animal, 
turned back; 4, peritoneum laid open and reflected; c, circular apertures in ditto; d, anterior 
portion of the proboscis; e, posterior or enlarged portion of ditto; f, cesophagus or anterior 
stomach ; g, liver ; h, intestine ; i, ductless gland, in connexion with the blood-system, overlying 
anterior portion of the reproductive organs ; j, portion of the reproductive organs; £, ovary; 
l, dorsal wall of the so-called pericardium; m, cerebral ganglia, giving off nerves to the various 
organs. 
Fig. 2. Dorsal view of the undisturbed viscera of D. nigra, seen through the transparent peritoneum: 
aa, dorsal skin laid open and turned back; 5, anterior portion of the proboscis; c, crop or 
anterior stomach ; d, liver; ee, reproductive organs; f, female channel; g, gland in connexion 
with ditto; A, ductless gland in connexion with the blood-system ; i, the so-called pericardium; 
J; ventricle, seen through the wall of ditto; k, aorta; l, cerebral ganglia, giving off various 
nerves ; m, intestine, 
Fig. 3. View of the anterior portion of the foot and head of D. nigra: a, mantle; 5, foot; c, thickened 
anterior border of ditto ; d, smooth area of ditto ; e, head, with lateral tentacular points ; f, oral 
orifice. 
Fig. 4. View of the renal chamber proper, the dorsal wall laid open, of D. gemmacea: a a, liver; b, in- 
testine ; c, anal nipple; d, ventricle of heart, turned forward; ee, portions of the wall of the 
so-called pericardium; ff, dorsal skin of animal; g 9, renal chamber proper; A A, dorsal wall 
of ditto, turned back ; 1i, apertures of branches of the renal chamber, penetrating the liver; 
Jj, external orifice of the renal chamber, with a needle passed through it; k, pyriform vesicle; 
l, orifice of ditto, leading into the so-called pericardium; m, orifice of ditto, leading into the 
renal chamber ; n, portion of the pericardial floor attached to the vesicle; 0, branchial plumes; 
P, efferent branchial channel, cut through; g, nerve, | 
, PLATE XVI. 
Fig. 1. General view of the viscera of D. nigra, the digestive system turned a little to the left pud 
a, anterior portion of the proboscis ; 4, posterior or enlarged portion of ditto; c, salivary glands’ 
d, a pair of glands, Opening into the anterior extremity of the proboscis; e, oesophagus oF on 
terior stomach ; f, liver; 9, intestine; hh, mucous gland of the female reproductive organs; 
i, glandular tube, leading to the penis—the vas deferens; jj, spermathecz ; k, oviduct, ail 
through ; /, pyriform vesicle connected with the renal organ; m, a shred of the pericardial floor 
attached to ditto; », ventricle of the heart, turned to one side ; 0, portion of the floor of the 80- 
3 ne pericardium ; p, portion of the auricle ; q, cerebral ganglia, distributing nerves a 
Various organs ; r, olfactory nerve; sss, aorta, cut through; ¢, ductless gland connected 
the vascular system; u, branchial plumes; vv, dorsal skin of the animal, turned back. 
