OCR Text |
Show 256 MR. P. S. ABRAHAM ON THE [Mar. 6, terior arise from the bases of the neighbouring plumes; the anus is tubular; the whole system is retractile into a cavity with a thin produced and crenate margin. Oral tentacles small, elongate, conical, and rather flattened. Foot much narrower and smaller than the mantle, truncated and grooved, with the upper lamina enlarged and divided in front. General colour of the spirit specimens olive, with indistinct brownish patches on the mantle-border and on the foot. Length (in spirit) 57 millims., breadth 42, height 12 ; width of lateral mantle-expansion about 16 millims. Hab. Port Essington. The mantle-spicules are rather small, spindle-shaped, and interlaced in bundles; they are absent in the extreme border of the mantle. Odontophore broad, with the numerous lateral spines reflected and bearing one or two small denticulations at the angle. DORIS MUSCULA, sp. nov. (Plate XXIX. figs. 6, 7.) Body elliptical, convex. Mantle covering the head and the foot, but not laterally flattened or extended into a border; it is covered above with very small, close, equal, elongated, linear or subclavate tubercles. Rhinophores (not visible in the specimen) retractile into cavities, of which the mouths are produced into short tuberculated sheaths. Branchiae 9, small, simply pinnate, or bearing lateral laminae, and compressed ; the margin of the cavity into which they are retractile is fringed with small elongated tubercles. Oral tentacles rather flat and linear. Foot oblong, rounded at the ends, with a deep transverse groove in front, the upper lamina being thin and mesially divided ; it does not extend behind as far as the mantle-edge. Colour of the spirit specimen greyish, with a yellowish tinge beneath ; on the back is a longitudinal band of faint reddish brown, extending from between the rhinophores nearly as far as the branchiae, and bordered on each side by an equally broad indistinct blue band, shading into grey on the outer sides ; the two latter bands join together between the rhinophores and before the branchiae. The coloration of these bands is produced by a very minute close freckling between the small tubercles. Length (in spirit) 13 millims., breadth 9, height 5. Hab. New Zealand. DORIS PUSTULATA, sp. nov. (Plate XXIX. figs. 18, 19.) Body oblong-elliptic, rather convex. Mantle large, extending everywhere beyond the foot, and bearing large, separate, sessile, clavate, flattened, rounded, opaque tubercles, some smaller than others, which become more numerous and smaller upon the border. Rhinophores short, clavate, rounded, retractile through short sheaths which have the margins furnished with three tubercular processes- one on each side, and the third posterior and smaller. Branchiae 8, small, bipinnate, the two posterior ones bifid, or indistinctly trifid, |