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Show 1906.] OF SOUTHERN INDIA AND CEYLON. 1005 teeth are erect, strong, but not very stout. The last one or two are reduced in size, but not degraded and still hamate. The middle part of the radula is more spaced than the rest, and 4-5 inner teeth on each side, which are lower than the others, seem to be set in the broad rhachis. But it is not clear if this position is natural. Though this radula is narrow, it is doubtful if the animal described by me (Gardiner, Fauna and Geography of the Maldive and Laccadive Archipelagoes, vol. ii. part 1 , p. 554) as Disc, pardalis var. is really referable to this species. It had a radula of only 13.0.13. D oris co n c in n a A. & H. = Discodoris concinna (A. <fc Ii.) and Disc, concinniformis Bgli. Labial armature composed of two triangular plates, consisting of a dense mass of irregular and sinuous rods. The radula consists of 17 complete rows and fragments of 3 or 4 others, with 45 teeth on either side of the rhachis in the longest rows. The innermost teeth are markedly lower than the rest and project into the wide rhachis ; the outermost are smaller but not degraded. This radula is not inconsistent with the supposition that D. concinna is Bergh's D. concinniformis. The formulae of the radulae examined by him are 27x44.0.44; 24x37.0.37; 31 x55.0.55. Some (but apparently not all) of his specimens had thickenings on the rhachis, which are not visible in Alder and Hancock's preparations. D oris osseosa Kelaart. ? = Sclerodoris osseosa Eliot, P. Z. S. 1903, vol. ii. p. 380; renamed Peronodoris, as this apparently identical genus has priority. Two radulae are preserved. They are yellow or brown, and consist of 21 and 26 rows of teeth respectively. On either side of the rhachis are from 35 to 50 teeth. The 5-6 innermost, particularly the one nearest to the rhachis, are short and slender. The rest are hamate, except the two outermost which are degraded. The 5-6 outermost decrease in size. Since both these radulae are unusually short, some doubt arises whether D. osseosa is really the same as the animal described by me I. c. The specimen preserved, though in bad condition, is apparently the same as mine, and, being smaller, may possibly have a shorter radula. D oris rust icata A. & H. 1. c. p. 120. = Staurodoris rusticata (A. & H.). One radula. light yellow in colour, consisting of 38 rows with remains of a 39th. There are about 50 teeth on each side of the |