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Show 252 MR. P. S. ABRAHAM ON THE [Mar. 6, Length (in spirit) 72 millims., breadth 46, height 14 ; width of mantle-expansion 13 laterally, 22 posteriorly. Hab. ? Mantle-spicules rather small, slender, and spindle-shaped. DORIS VESTITA, sp. nov. (Plate XXVIII. figs. 5, 6.) General form elliptic, very convex on the back. Mantle ample, fleshy, widely expanded all round, in broad waves or folds at the border, covered closely on the upper surface with small, elongated, conical or slightly clavate, semitransparent tubercles, which are somewhat larger upon the marginal expansion. Rhinophores clavate, laminated for four filths of their length, the laminae being diagonal, about 14 in number, and lying between slight anterior and posterior longitudinal depressions; the apices are truncated, and bear a broad simple terminal style ; the cavities into which they are retractile are produced into short tuberculated sheaths with toothed edges. Branchiae 7, short, broad, tripinnate, not very distinctly separated from each other, and set in a circle, interrupted behind, around a tubular anus : the wall of the cavity into which they are retractile is somewhat raised and irregularly denticulate at the margin1. Oral tentacles small, elongated, and conical. Foot about one third as broad as the mantle, rounded in front, with a deep transverse groove, the upper lamina of which is mesially divided ; the posterior end is acuminated, and does not extend as far as the mantle-edge. The general colour of the spirit specimens is a yellowish or light brown, with an orange or pinkish tinge upon the foot. Length (in spirit) 42 millims., breadth 32, height 15. Hab. Straits of Magellan. The pallial spicules are slender, comparatively rather small, tolerably straight, and numerous. The odontophore is very small: there are about 13 transverse rows of numerous elongated recurved spines, none of them central in position. DORIS MURREA, sp. nov. (Plate XXVIII. figs. 12-14.) Body elliptic, oblong, rather convex. Mantle ample, cartilaginous, the border expanded and rather thick ; the surface granular and gritty to the touch from the close covering of minute, unequal, rounded, hard tubercles. Rhinophores far forward, small, clavate, the laminae proceeding from a posterior longitudinal ridge; their cavities are with slightly raised and minutely denticulated margin. Branchiae 6, slender, bipinnate, set far back, closely around a very small tubular anus, in a deep cavity, which has the margin raised, denticulated, and completely contractile. Oral tentacles small, conical, and pointed. Foot oblong, transversely grooved in front, with the upper lamina rather enlarged and notched. 1 In one specimen the branchiae seem to be more numerous in consequence of their indistinct separation and of the prolongation of their lower branches. The sheath of the branchial cavity is also more deeply and distinctly toothed. |