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Show 1877.] A N T H O B R A N C H I A T E N U D I B R A N C H I A T E M O L L U S C A . 251 the border crenulate. Rhinophores elongate-conical, upon a contracted base, with minute numerous laminae, extending far down, retractile into deep cavities, which have the openings raised into denticulated sheaths. Branchiae 7, bipinnate, spreading ; along the internal face of each plume lie a central midrib and two lateral longitudinal bordering veins ; between these extend delicate upright laminae, which, towards the free end of the plume, become developed into branches. The anus is short, with the aperture somewhat fimbriate and dentate. The branchial cavity has the border raised and indistinctly lobulate. Oral tentacles short, subconical, and rathe*: grooved above. Foot narrow, widest across the middle, with an anterior transverse groove, the upper lamina of which is deeply notched, a little enlarged, and bearing one or two terminal papillae at each side of the notch. The foot becomes acuminated, small, and free behind. Colour of the spirit specimen light brownish, closely and irregularly blotched with reddish brown on the back, and with darker unequal spots upon the mantle-expansion. Branchiae and rhinophores light brown. Underneath, the general tint is yellowish brown, with an orange tinge upon the foot, and with a few large unequal round or oval black spots upon the sides of the body and upon the neighbouring portion of the mantle ; some smaller spots are upon the sides of the foot. Length (in spirit) 45 millims., breadth 32, height 10. Hab. Amboina. The mantle-spicules are numerous, slender, elongated, cylindrical, and interlacing. DORIS STRAGULATA, sp. nov. (Plate XXVIII. figs. 7, 8.) Body oval, convex on the back. Mantle very large, soft, thick, and fleshy, especially on the expanded border, the edge of which is irregularly crenate : it is thickly covered above with small, unequal, rounded tubercles ; beneath, it is smooth. The rhinophores are short and clavate, with rounded and somewhat mucronate tips: their cavities have the margins produced into wide tuberculated fleshy sheaths. Branchiae 6, short, tripinnate, closely embracing the short tubular anus, and retractile into a deep cavity with a 6- lobed margin. Oral tentacles flat, linear, and pointed. Foot comparatively small, oblong, rounded at both ends; anteriorly with a deep transverse slit, having the upper lamina expanded, mesially divided by a large triangular notch, and more or less lobulated. The outline of the lower lamina is rather crenulate. General colour (in spirit) a mottled grey, lighter upon the mantle-expansion, the darker tint being formed by a minute dotting between the tubercles. The rhinophores are grey, with whitish tips ; the branchiae greenish mottled grey. On the under surface a broad mottled brown band is situated all round between the foot and the mantle-margin. The latter is yellowish, and the wavy line of demarcation is tolerably distinct. The oral tentacles are yellowish, and the foot brown and blotchy except on the edge. |