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Show 1906.] OF SOUTHERN INDIA AND CEYLON. 667 poor and adds nothing to Kelaart's description, but the animal may perhaps be identified, as it is said to be " found in great abundance on rocks in Dutch Bay at low-water mark." Kelaart associates it with Doris atrata (= Doridopsis nigra); so it may perhaps be a Doridopsis. Allowing for variations, Doridopsis tristis B. and Doridopsis indaca Tapp.-Can. have a somewhat similar coloration. Doris rufopunctata (Kelaart, I.e. I. p. 297) (PI. XLII. fig. 5). There are not sufficient data for assigning this form to any genus. It is expressly said that it is coriaceous and stiff; so it may prove to be a Platydoris. Doris constantia (Kelaart, I.e. I. p. 298) (PI. XLII. figs. 8 & 9). Both the description and the drawing seem to characterise the animal sufficiently externally, but it is impossible to say to what genus it belongs. Doris castanea (Kelaart, I.e. I. p. 303) (PI. XLII. figs. 6 & 7). This is possibly the animal described by me as Sclerodoris ( = Peronodoris) tubercidata (Proc. Zool. Soc. 1903, ii. p. 381), but the identity cannot be proved from the materials supplied by Kelaart. Doris aripona (Kelaart, 1. c. II. p. 269) (PI. XLV. fig. 2). It is impossible even to guess to what genus this species should be referred, but it looks recognisable. D o r is n iv e a (Kelaart). (Kelaart, 1. c. I. p. 296.) It may be doubted if Kelaart is light in suggesting that this is the Doris (Chromodoris) pallida of Riippell <fc Leuckart. His alternative suggestion that it is akin to Doris (Cadlina) repanda is more probable, but in Cadlina the oral tentacles are generally flat and grooved, not lineair. It may belong to the Doridopsidse, Doridopsis bataviensis and Doriopsilla pallida are whitish. No drawing of the species has been found. T revelyana. This genus was founded by Kelaart for T. ceylonica in the Ann. & Mag. Nat. Hist. ser. 3, 1858, vol. i. p. 257. Perhaps the Gymnodoris of Stimpson (1855) is a synonym. If so, the name has priority, but Stimpson's description is inadequate. Trevelyana and Nembrotha form a small group within the Polyceridae, characterised by the entire absence of frontal and dorsal appendages. The dorsal margin and frontal veil are vestigial or entirely absent. The rhinophores are retractile, the branchiae non-retractile. There are no jaws. The penis is armed with spines. The oral tentacles are small. The foot is narrow and the general shape limaciform. Greilada somewhat resembles this group in external characters, but has frontal appendages, and the buccal parts are as in Polycera. |