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Show 1904.] FROM EAST AFRICA AND ZANZIBAR. 399 This form has many points of resemblance to Chr. albo-notata B., but the dentition seems different. 17. (?) CHROMODORIS FLAVA. (Plate XXIV. figs. 8 & 9.) Chromodoris flava Eliot, Abstr. P. Z. S. 1904, No. 4. p. 15, March 8. One specimen dredged on the West Coast of Zanzibar. The living animal was 11 mm. long and 3 wide. The colour everywhere, including the rhinophores and branchiae, was a bright lemon-yellow. Round the mantle-edge ran a blood-red border of irregular width. The branchiae were six, simply pinnate, and with few pinnae. The mantle-edge was undulated and ample. The back was flat. The foot projected about 2 mm. posteriorly, and was considerably expanded in front. (From the drawing it appears to be grooved but not notched.) The animal adhered very strongly. The tentacles were hardly visible, being merely two small blunt knobs on the snout. Tbe specimen has unfortunately been lost, but I give the figures. Genus CASELLA (Cuv.). This small group, though easily recognised by its clearly marked and much undulated mantle-margin, is not distinguished from Chromodoris by any features of importance, and there is no sufficient reason, except convenience, to maintain it as a separate genus. The chief character is the aforesaid undulation of the fairly broad mantle-edge, and the outermost teeth of the radula are smooth instead of being denticulate on the apex. Bergh recognises three species, all from the Indo-Pacific. CASELLA ATROMARGIXATA (CUV.). [Bergh, Jour. cl. Mus. Godeffroy, vi. 1874, pp. 102-9; id. S. R. xvii. p. 942.] One specimen from the West Coast of Zanzibar. The notes describe the living animal as long and tapering, with a flat back and a mantle-edge only slightly projecting but elaborately wrinkled at the sides. The foot hardly extended beyond the dorsal area. The general colour was brown, with numerous small grey spots, but towards the edge of the mantle became first yellowish and then greenish. The mantle-edge itself was defined by a very distinct black border. The rhinophores were black, with a grey line on the edge of each lamella. The gills were black and grey, set in a double spiral and kept in motion. The animal was about two inches long, and, in spite of its sombre coloration, a handsome creature. These characters and colours are well preserved in the alcoholic specimen. The mantle is narrow both at the sides and behind, and somewhat expanded only over the head. The branchiae are arranged in a double spiral meeting in front but leaving an open |
