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Show 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. Branchiae 8, short, stout, tripinnate, the last two arising from the stalks of the next plumes; in front of the interval between these two hindermost branchiae 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 proboscis ; 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 branchiae are smoky, as is the margin of the foot. There are no blotches beneath. Length (in spirit) 25 millims., breadth 18, height 13. Hab. ? DORIDOPSIS 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. Branchiae 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. 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 inflated and transparent on the back, pustulose in front, the border |