674 sin c. ELIOT ON NUDiBRAKfCHS [June 19, 



tliis fonn are, when alive, glossy black with slate-blue ridges and 

 orange tubercles on the back. 



Bergh (Siboga, p. 180) observes that the genus CeralophylUdia 

 Eliot "ist wohl mit der Phyllidiopsis identisch." It is not 

 denied that the mouth-parts are as in Phyllidiopsis, but the back 

 is studded with papillae which consist of soft globes mounted on 

 flexible stalks which shake when the animal moves. They seem 

 to me strikingly different from the flat hard tubercles of the other 

 Phyllidiidee, and to constitute a suiScient generic character. 



Phyllidia zeylanica Kelaart. (Plate XLII. fig. 10.) 

 (Kelaart, 1. c. II. p. 494.) 



Bergh (System, p. 1120, and elsewhere) regards this species 

 as equivalent to Fhyllidia varicosa, but the identification oflers 

 many diificulties. The rhinophores and oral tentacles are said to 

 be black, whereas in Ph. varicosa they are yellow. The foot is 

 whitish, whereas in Ph. varicosa it is blackish or purplish with 

 a deep black median line. Also the general arrangement of the 

 dorsal pattern is not the same. It cannot be said that in Ph. 

 varicosa "three continuous black lines run round the whole 

 length" of the back. The foi-m seems to have greater affinities to 

 Ph. rosans, but here also differences of shape and colour present 

 themselves, for among other points Ph. zeylanica is more dis- 

 tinctly tubei-culate. It must, I think, be regarded provisionally 

 as a separate species. 



BoRNELLA DiGiTATA Ad. & Reeve. 



(=jg. hancockana Kelaart, 1. c. III. p. 269.) 



Among the drawings are two labelled " Bornella digitata " and 

 " Dendronotus vel Bornella HancocMi" both containing figures 

 of the entire animal and of the rhinophores and papillse separately. 

 In both there are five pairs of papilla? behind the rhinophores, and 

 no difi'erence is discei-nible except that in B. digitata the rhiuo- 

 phorial papillfe have five branches and the others three, whereas 

 all five are repi-esented as having four branches in B. hancockii. 

 But even this difference is not observed in the figures of the 

 entire animals. 



The two names are clearly synonyms. 



SCYLL^ID^. 



The family contains two genera : Scyllcea L. and Crosslandia 

 Eliot. The latter is closely allied to Scyllaea in structure but 

 differs in appearance, since the dorsal margin instead of bearing 

 two large papillae on either side, is expanded into a single wing- 

 like flap. 



Like other genera of pelagic, or semipelagic, nudibranchs, such 

 as GlatLcus, Phylliroe, and Hexahranckus, Scyllcea presents 

 numerous varieties differing in colour and external details, among 

 which it is extremely hard to find valid specific chai-acters. Also 



