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Art. XXIV.—On two new Planarians from Auckland Harbour.
[Read before the Auckland Institute, 27th September, 1882.]
1. Thysanozoon aucklandica, n. sp.
Body thin, depressed; margin ample, with numerous irregular folds and puckers. Upper surface wholly covered with large mobile clavate papillæ. Colour varying from dark ashy-brown to light grey, marbled or shaded with paler streaks, sometimes reddish-brown; under-surface an opaque greyish-white, the gastro-vascular canals showing through of a chalky-white colour. Head indistinct. Tentacles two, formed by mere folds of the anterior margin of the body. Eye-specks about 75, forming a crescentic patch in
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an open space between the tentacles, or sometimes broken up into two separate patches. The colour of the papillæ is usually a dark grey or brown with two or three opaque white specks. Length, 1–2 inches; breadth, ½–1 inch.
Common under stones near low-water mark in Auckland Harbour.
2. Leptoplana (?) brunnea, n. sp.
Body oblong, thin, flat, depressed, smooth, and even; margin ample, entire. Colour of the upper surface a chocolate- or reddish-brown, sprinkled and streaked with minute darker specks; under surface much paler, the dendritic gastro-vascular canals showing through. No distinct head or tentacles. Eye-specks very numerous, minute, placed in a row just within the margin all round the anterior portion of the body. Total length, 1–2 inches; breadth, ½–1 inch.
Common under stones in muddy places in Auckland Harbour.
The position of the eye-specks does not at all agree with Stimpson's definition of Leptoplana given in the Proceedings of the Academy of Sciences, Philadelphia, 1857, p. 21; but at present I do not know a better genus in which to place it.