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Show 1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 255 yellowish. Beneath, there is a small, unequal, dark freckling, with larger spots upon the foot, and especially upon the upper surface of its border; the ground-colour of the foot is yellowish. Length (in spirit) 32 millims., breadth 19. Hab. The Seychelles. In two of the specimens the mantle is broader, and the spots upon the under surface are larger on the mantle than on the foot; in one of them the tubercles are smaller, more conical, or subclavate, and the rhinophores are more massive, the purple of the branchial midribs is also more decided and not produced solely by a minute freckling ; in the other the foot is comparatively very small, and the lateral and posterior border of the mantle is widely expanded and fleshy. The mantle-spicules are rather small, spindle-shaped, and generally more or less bent. Odontophore broad, with about 19 rows of numerous, strongly reflected spines, none of them mesially placed. DORIS LANUGINATA, sp. nov. (Plate XXIX. figs. 15-17.) Body ovate, rather convex. Mantle large, expanded all round, with a wavy irregularly crenate border; it is covered closely with numerous, small, soft, linear tubercles. Rhinophores clavate, short, thick, truncated at the apices, and with numerous fine lamellae extending far down; they are retractile within large, wide, denticulated and tuberculated sheaths. Branchiae 5, short, broad, tripinnate, set deeply in a pallial cavity with raised denticulate margin ; the short tubular anus is situated almost between the two posterior plumes. Oral tentacles flat, spatulate, and longitudinally grooved above. Foot oblong, rounded at both ends, with a deep transverse slit in front, the upper lamina divided, and with a short process in the middle ; flattened, and with crenulate edge at the sides and posteriorly. Colour of the spirit specimen dirty greyish brown, mottled with darker, the dark shade prevailing over the upper surface, except on the more central dorsal area. Below, the tint is uniform and lighter, with the exception of a few dark-brown spots ; the upper surface of the border of the foot is freckled and sparsely spotted with dark brown. Length (in spirit) 33 millims., breadth 23, height 13. Hab. New Zealand. The mantle-spicules are small, short, and often a little bent. DORIS COLLATATA, sp. nov. (Plate XXIX. figs. 25, 26.) Body elliptic, convex on the back. Mantle very large, soft, produced into a thin, wavy, crenulate border, and covered with numerous, small, unequal, rounded tubercles; the under surface is subgranular. Rhinophores short, thick, clavate, rounded at the tips, with numerous fine laminae reaching down to the short pedicle, and retractile within wide cavities which have the margins produced and denticulated. Branchiae 8, tripinnate, the lateral ones longest; the two most pos- |