1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 265 
puckered in the anterior regions, and with the free border very short, 
rather thick and wavy. Rhinophores apparently short, clavate, 
somewhat laterally compressed, and laminated far down, retractile 
in cavities the openings of which are minute and slightly raised, 
and situated close together and far forwards. Branchiz 8, short, 
stout, tripinnate, the last two arising from the stalks of the next 
plumes; in front of the interval between these two hindermost 
branchize is situated the tubular anus: the common cavity is 
smoothly rimmed. Foot oblong, broad, rounded in front and 
behind, the border thick and wavy ; there is a shallow transverse groove 
in front ; and through the middle of this is the opening for the pro- 
boscis ; behind, the foot does not extend beyond the mantle. 
Colour of the spirit specimens dirty white, with a few irregular 
large and small cloudy black blotches, principally on the sides of 
the back ; they are smaller and closer anteriorly. The mantle-border 
shades into black ; and the rhinophores are black ; the edges of the 
branchiz are smoky, as is the margin of the foot. There are no 
blotches beneath. 
Length (in spirit) 25 millims., breadth 18, height 13. 
H 2 
ab. ——! 
Doripopsis INORNATA, Sp. nov. (Plate XXX. figs. 33-35.) 
Body ovate-oblong, rather broader behind, convex, soft. Mantle 
fleshy, with the border small and irregularly crenate. Rhinophores 
rather short, clavate, kneed in front, somewhat laterally compressed, 
diagonally laminated, and with rounded apices ; the orifices of their 
cavities are a little raised and contractile; they are situated close 
together and far forward. Branchiz 6, rather large, tripinnate, 
somewhat irregular, and with some of the stalks more or less joined 
together ; the tubular anus is eccentric, a little to the left; the 
margin of the common cavity is fleshy and slightly lobate. Foot 
oblong, not very broad, rounded in front, acuminate behind, and not 
extending beyond the mantle: it is transversely grooved in front, 
with the upper lamina notched; and immediately above this are two 
small pits; the opening for the proboscis is in the centre of the 
groove, which is there enlarged. 
Colour of the spirit specimen dirty brownish-white, with the 
margins of the mantle and foot darker, and with a few small irregular 
black spots scattered on the back and sides. Rhinophores smoky, 
with lighter tips. é 
Length (in spirit) 25 millims., breadth 18, height 10. 
Hab. Mediterranean. 
The integument is furnished with spicules, which are very minute 
and blunt; they are scattered, not very closely, just beneath the 
epidermis. In none of the other Doridopses described in this paper 
could definite spicules be found. 
DoRIDOPSIS SUBPELLUCIDA, sp. nov. (Plate XXX. fig. 36.) 
Body oblong-ovate, broader behind, rather convex. Mantle in- 
flated and transparent on the back, pustulose in front, the border 
