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Show 258 MR. P. S. ABRAHAM ON THE [Mar. 6, cles. (Rhinophores retracted and not visible in the specimen.) Branchiae 10, small, slender, simple, strap-shaped, pointed, the inner edge serrate ; they surround the anal opening, and are completely retractile into a cavity with a contractile orifice. Mouth in the centre of a triangular raised surface, the side angles of which are produced but not free ; on each side of the oral opening is a small indistinct tubercle. Foot not quite one third as broad as the mantle, truncated in front, with the margin thin and mesially notched, and rather produced laterally at the angles; it gradually narrows to a rounded point behind, and does not extend beyond the mantle-border. Colour of the spirit specimen transparent white, with the pustules and the margins of the mantle and foot opaque white ; the tubercles are vellowish; the branchiae yellowish, lineated with white. Length (in spirit) 12 millims., breadth 10, height 5. Hab. ? In a section of the mantle but one doubtful spicular-looking body was seen. DORIS PECULIARIS, sp. nov. (Plate XXX. figs. 15-17.) Body oblong, rounded at both ends, convex, soft. The mantle reaches down over the head and foot all round, but with not much of the border free ; it is rather closely covered above with unequal, rotundate, soft, subrugose; flattish tubercles; and underneath it is marked with reticulating raised striae. Rhinophores oblong, slender, broadest at the apex, rather compressed from before backwards, rounded at the base and marked with minute laminations; they appear to arise from the anterior base of a large, sessile, whitish opaque body, which occupies the floor of the rimmed wide cavity into which the rhiuophore is retractile ; they are placed well forward and rather close together. Branchiae 5, wide, deeply divided, and indistinctly tripinnate; they are set in a circle interrupted on the left side ; and between the two plumes which bound the hiatus is situated the soft tubular anus ; between the latter and the roots of the neighbouring branchiae extend ridges or laminae ; the whole system is retractile within a circular, rimmed cavity, situated far back. Mouth minute, in the middle of an indistinct, small, triangular, bilobed, raised surface, without tentacular appendages. Foot oblong, broad, nearly coextensive with the mantle, rounded in front and behind, the border flattened all round and notched in front. General colour of the spirit specimen purplish grey, with the tubercles of a darker and more reddish tint. Length (in spirit) 26 millims., breadth 13, height 9. Hab. South Australia (Port Lincoln). The mantle-spicules are short, mostly spindle-shaped and bent. DORIS PR^ETENERA, sp. nov. (Plate XXX. figs. 10-12.) Body elliptic, broad in the middle, more or less acuminated at the ends, rather convex, soft. Mantle smooth, fleshy, semigelatinous, the border fleshy and not much expanded. Rhinophores clavate, dia- |