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Show 1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 257 set round the tubular anus in a circle interrupted in front as well at the hack ; the produced margin of their cavity is covered with small tubercles and is crenulate. Oral tentacles in the form of small, conical, lateral tubercles. Foot small, oblong, transversely slit in front, and with the anterior lamina notched ; gradually tapering and rounded behind. Colour (in spirit) semitransparent yellowish white, with the tubercles opaque. Length (in spirit) 32 millims., breadth 21, height 12. Hab. Australian seas. The mantle-spicules are small, straight, and cylindrical. DORIS RARIPILOSA, sp. nov. (Plate XXIX. figs. 29, 30.)] General form elliptic-oblong, convex. Mantle ample, soft and membranous on the back, subcartilaginous on the sides, where it is thickened and a little expanded ; the border is irregularly and sparingly crenulate ; the upper surface bears small, scattered, linear, soft papillae, which are tolerably numerous on the sides, but are fewer on the back and on the border; between the papillae are small, short, conical tubercles, becoming rounded on the border, and giving to the latter a granular appearance ; the inferior surface is smooth. Rhinophores short, broad, subclavate or conical, pointed, with the numerous small diagonal laminae reaching far down and extending between slight anterior and posterior ridges; they are retractile into cavities with raised and denticulated margins. Branchiae 6, short, wide, tripinnate, the main branches deeply divided. The anus is elongated, its base greatly enlarged and its orifice denticulated ; the common cavity has the border prominent and indistinctly lobate. Head large ; oral tentacles flat, semicrescentic in outline, and pointed forwards and inwards. Foot elongate, but not reaching to the posterior edge of the mantle, much narrower than the latter, truncated, transversely grooved, with the upper lamina widely notched in front, gradually acuminating to a rounded point behind. Colour of the spirit specimens light dirty brown above, thickly mottled with brownish black on the sides and around the border; the branchiae are light reddish brown; underneath, the general tint is reddish brown, with a dark minute speckling on the head, on the anterior portion of the mantle, and on the sides of the foot, and with large irregular black blotches, running into one another, on the sides of the body, between the foot and the mantle. Length (in spirit) 64 millims., breadth 38, height 24. Hab. ? The mantle-spicules are small, spindle-shaped, and slightly bent or curved. DORIS MOLLIPUSTULATA, sp. nov. (Plate XXX. figs. 13, 14.) Body broadly ovate, gently convex, and very soft. Mantle large and pulpy, the border extended at the sides and gradually thinning to a subcrenulate edge ; it is covered above with opaque, raised, unequal, soft, pustular surfaces, each of which bears one or more tuber- P R O C ZOOL. Soc-1877, No. XVII. 17 |