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Show 1877.J ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 263 retractile, situated around the anus, far back and low down. veil short, very wavy, the sides prolonged, free, and flattened. Foot broad, truncated in front, with a very indistinct transverse groove; it is rounded behind ; and the margin all round is very wavy. Colour of the spirit specimens transparent white, with a blue coloration on the back and sides; some of the lower tubercles have a reddish or brownish tinge at the base; the rhinophores are faint purplish, becoming lighter at the apex ; the branchiae are variegated with grey. Underneath, the margin of the mantle is marked with fine, close, radiating, reddish-brown-purplish lines; the foot and oral veil are yellowish white. Length 17 millims., breadth 13, height 12. Hab. New Zealand. The spicules of the mantle-border are rather numerous and long, tolerably slender and spindle-shaped ; they seem to be arranged radially; in other parts they are smaller and more crooked, and are agglomerated in small scattered bundles. The buccal apparatus is very small; the buccal collar seems to be very rudimentary, if present at all. The odontophore is narrow, and bears 19 transverse rows, each containing but 2 large spines, and on each side from 4 to about 7 rudimentary conical ones. The base of the large spine appears to be membranous at one part below ; it is laterally flattened and subquadrangular. DORIDOPSIS AUSTRALIENSIS, sp. nov. (Plate XXX. figs. 25, 26.) Body oblong-elliptic, smooth, soft, and subdepressed; mantle with the margin subcrenulate, rather wavy, and not much extended; Rhinophores small, clavate, pointed, transversely laminated above, and retractile within sbeathless cavities. Branchiae 6, slender, bipinnate, sometimes divided, situated far back, with the protrudent anus between the two hindermost plumes, in a simple-edged mantle-cavity. The suctorial mouth is retractile through an opening in the front border of the foot; and in front of it are two minute triangular lobes. Foot elliptic-oblong, rounded at both ends; anteriorly there is a slight transverse groove, the upper lamina divided by the mouth-opening. Colour of the spirit specimens semitransparent bluish grey, almost white towards the border and underneath, darker on the dorsal region; the rhinophores are smoky, with white tips ; the branchiae grey. Length (in spirit) 18 millims., breadth 10. Hab. New South Wales. This may be a young form of the animal called Actinodoris australis by Mr. Angas (loc. cit.), whose figure, however, represents but 5 branchiae, and a uniform olive-black colour ; the description is too meagre for any accurate determination. DORIDOPSIS OBSCURA, sp. nov. (Plate XXX. figs. 29, 30.) Body oblong, rounded at the ends, rather convex; mantle soft, slightly rugose, the boder subcrenulate and but little extended, |