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Show 260 MR. P. S. ABRAHAM ON THE [Mar. 6, pointed behind, subprismatic, the dorsal surface flat or but little curved ; soft, the sides raised. Mantle small, with the border but little extended and not reaching to the foot, or much over the head, the edge subcrenulate and upturned in parts, especially in front; it is covered above with minute, soft, flattish tubercles. Rhinophores elongate, slender, clavate, pointed, laminated above, inclined laterally, and retractile into cavities with the margins raised into very short, smooth sheaths. Branchiae 6, small, slender, apparently bipinnate, the two hinder ones bifid; the anus is short and tubular, and placed in front of the interval between the two hindermost plumes; the whole system is retractile within a small marginated branchial cavity, which is situated very far back. Oral tentacles long, linear, and pointed. Mouth subterminal, in the centre of a large rounded tubercle. Foot oblong, narrow, truncated in front, free and roundly pointed behind, but not reaching beyond the mantle-border. Colour of the spirit specimen transparent yellowish white, with the viscera showing through tbe back and side in a purplish patch. The mantle-border is marked above with a few greyish pitted spots. Length (in spirit) 20 millims., breadth 10. Hab. Chilian coast (Chiloe). In a small section of the mantle-border no spicules could be distinguished. CHROMODORIS? MOLLITA, sp. nov. (Plate XXX. figs. 18, 19.) Body oblong, rounded at both ends, not much compressed, soft. The mantle is expanded into a short, free, wavy sublobate border, rather enlarged posteriorly and over the head; it is nowhere erect. Rhinophores apparently short, thick, clavate, with the upper portion laminate and pointing backwards; their cavities have the openings completely contractile and but barely raised. Branchiae about 27 in number, irregular, pinnate, some of "them divided into two or more branches towards the apex ; and the hinder ones are small; thev are set upon a rhachis, turning inwards behind, which lies in front and at the sides of the short tubular anus, and are retractile into a cavity with the margin somewhat raised. Mouth subterminal, without tentacles or veil. Foot oblong, truncated, and with a shallow transverse groove in front, rounded, flattened, and extending beyond the mantle-border behind. Colour of the spirit specimen semitransparent greyish white, mottled with opaque white. The roots and midribs of the branchiae and the edges of the rhinophore-laminae are opaque white. Length (in spirit) 19 millims., breadth 11, height 8. Hab. ? HEXABRANCHUS ORBICULARIS, sp. nov. (Plate XXX. fiss 23. 24.) & Form depressed, outline nearly circular. Mantle expanded all round, except in front, gradually thinning off into a membranous subcrenulate and fimbriate border. Rhinophores small, conical above, laminated and recurved, retractile into narrow cavities with slightly |