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Show 1877] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 267 DORIDOPSIS VARIATA, sp. nov. (Plate XXIX. figs. 23, 24.) Body oblong, raised, soft. Mantle extending down over the foot, but haying very little of the border free ; in front and at the back the latter is somewhat lobate ; the surface is very indistinctly rugose. Rhinophores long, slender, linear, pointed, laminated far down, and laterally compressed ; their cavities with marginated edges. Branchiae 5, very long, slender, tripinnate, diminishing in size from the front one ; the tubular anus is independently retractile a little in front of the interval between the two hinder plumes; the general cavity has a quinqui-sublobate edge. Foot oblong, rounded in front, abruptly acuminate behind, and then extending, like a flat oblong tail, beyond the posterior mantle-border. Above the opening for the proboscis in the anterior margin are two short, rounded, lateral tentacular appendages. Colour of the spirit specimen greyish white, variegated with scattered, dark bluish grey, unequal blotches or spots borne on indistinct flat pustular surfaces ; the larger ones are arranged longitudinally with some regularity ; on the back moreover is a row of three irregular lozenge-shaped or angular outlines; and along each side is a row of 4 or 5 similar but larger and more distinct markings. Length (in spirit) 20 millims., breadth 9, height 8. Hab. China (Ningpo). DORIDOPSIS PARVA, sp. nov. (Plate XXX. figs. 27, 28.) Body elliptic, convex, raised at the sides. Mantle soft, smooth, with a very short, free, wavy border ; there is a broad interval at the sides between the mantle and the foot. Rhinophores small, clavate, rounded and laminated above ; the orifices of their cavities rather protrudent and contractile, placed near together and far forwards. Branchiae small, apparently bipinnate, and above 7 in number, the two hindermost rather larger and trifid ; the margin of their common cavity closes over them. The foot is broad, truncated in front, gradually narrowing, and becoming rounded behind : very little of it is free. Colour of the spirit specimen semitransparent white, with the border, the branchiae, the rhinophores, and the foot more opaque. Length (in spirit) 9 millims., breadth 7, height 6. Hab. ? In conclusion, I wish to record m y thanks to Dr. Giinther, F.R.S. &c, who has given me facilities for studying these animals, and who has kindly allowed m e to make an abstract, in this paper, of the Descriptive Catalogue which I have been preparing for the Natural- History Department of the British Museum. |