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, Doridojjsis 

 tristis B. and Doridopsis indaca Tapp.-Oan. have a somewhat 

 similar coloration. 



Doris rufo2yunctata (Kelaart, 1. c. I. p. 297) (PI. XLII. fig. 5). 

 There are not sufiicient 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 Gonstcmtia (Kelaart, 1. c. 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, 1. c. I. p. 303) (PI. XLII. figs. 6 & 7). 

 This is possibly the animal desci-ibed by me as Sderodoris 

 [ = Pero7iodo7'is) titberculata (Proc. Zool. Soc. 1903, ii. p. 381), 

 but the identity cannot be proved from the materials supplied by 

 Kelaart. 



Doris arij)ona (Kelaart, 1. c. II. p. 269) (PI. XLY. fig. 2). It 

 is impossible even to guess to what genus this species should be 

 referred, but it looks recognisable. 



Doris nivea (Kelaart). 

 (Kelaart, 1. c. I. p. 296.) 



It may be doubted if Kelaart is i-ight in suggesting that this is 

 the Doris [C/iromodoris) pallida of Rlippell & Leuckart. His 

 alternative suggestion that it is akin to Doris {Cadlina) rej^anda 

 is more probable, but in Cadlina the oral tentacles are generally 

 flat and grooved, not linea^. It may belong to the Doridopsid8e, 

 Doridopsis hataviensis and Doriopsilla pallida are whitish. No 

 drawing of the species has been found. 



Trevelyana. 



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 JSTembrotha 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 Folycera. 



