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Show 1904.] FROM EAST AFRICA AXD ZAXZIBAR. 395 discernible. All the teeth which I examined were hamate, with bifid tips, exactly like those of Chr. semperi as figured by Bergh. Another specimen captured at Chuaka, on the East Coast of Zanzibar, seems to belong to the same species, though at first sight is strikingly different from the individual described above, being larger, stouter, and of another colour. The notes on the living animal describe it as lemon-yellow, with very deep purple-black stripes ; the gills and rhinophores vermilion ; the foot purplish underneath and at the edges. The preserved specimen is pale yellow, with black lines arranged much as already described, including a horseshoe round the branchiae, but shorter and more numerous. It is 30 mm. long, 15 high, and 13 broad. The mantle-edge is a narrow thick ridge, measuring P5 mm. at the sides, 2-5 over the head, and 3 over the tail, which is 10 m m . long. The body is high and thick, but the sole of the foot narrow (maximum 3 mm.). The pockets of the rhinophores and branchiae are small and very slightly raised. The branchiae are ten, set in a complete circle, but the anterior plumes are larger than the posterior. One of the latter is very small and perhaps merely an offshoot. The foot is rounded in front, grooved but not notched. The tentacles are retracted and hardly visible. The labial armature is yellowish and formed of short thick hooks. The formula of the large and closely-packed but very fragile radula is about 90 X 75.0.75. The teeth are mostly bifid at the tip and otherwise smooth. Only the innermost have an accessory denticle on the inner side, and are thus trifid. The outermost are serrulate at the apex. These two specimens seem to be merely colour-varieties of a single species which is closely related to Chr. semperi B. Except that the external teeth of the radula bear more numerous and more distinct serrulations, the principal characters appear to be identical. But whereas Chr. semperi is spotted, the animals here examined are marked with exceptionally clear and narrow black lines, which seem engraved on the surface. They must therefore be accorded specific rank, at least provisionally. It is possible that intermediate forms may be discovered, as the variety first described bears some yellow blotches. 11. CHROMODORIS SCURRA B. Chromodoris scurra Eliot, Proc. Acad. Nat. Sci. Philadelphia, Dec. 1899, p. 518. [Bergh, S. R. xi. p. 478, and Journal de Mus. Godeffroy, Heft vi. 1874.] Two specimens from Zanzibar Harbour. The colours of the living animal are brilliant. Down the centre of the back runs a Avhite line, and on each side of it are borders in the following order : (1) narrow deep red line, (2) broad orange-yellow band, (3) narrow deep red line, (4) violet band, which broadens out anteriorly and posteriorly, (5) white border running |
