840 Proceedings of the Royal Irish Academy. 



some frequency on the Zostera beds in the Plymouth district 

 (see Garstang's description, loc. eit.). Most of these highly 

 coloured examples agreed with their more typical companions in 

 their slender elongate form ; but other specimens were met 

 with at Valencia showing some approach to G. picta in both 

 shape and colour, so that we were in doubt to which species 

 they should be referred. Indeed, it appears to me doubtful 

 whether G. Farrani and G. picta can be specifically distin- 

 guished ; and there seems little reason to regard Eolis Adelaides, 

 Thompson, and the F. Rolertiance and U. andreapolis of 

 M'Intosh as more than colour varieties of G. Farrani. On the 

 other hand, G. Farrani is, in my opinion, quite distinct from 

 G. tricolor, to the synonymy of which it was relegated by 

 Priele and Hansen. This view is now shared by Mr. Garstang, 

 who informs me that he was not acquainted with the real G. 

 tricolor in 1890 when he wrote his account of the Opisthobran- 

 chiata of Plymouth. In point of fact G. tricolor is one of the 

 commonest Jfudibranchs on the trawling grounds in 20-30 fms. 

 off the south coast of Devon and Cornwall, but the resources 

 of the Plymouth Laboratory did not at that time j)ermit of 

 much exploration in the Channel. Besides inhabiting totally 

 different ground, Galvina tricolor differs from G. Farrani in 

 attaining much greater size ; it is in particular a much wider 

 and stouter form, and its papillae are larger and more inflated, 

 and so crowded as to be usually much flattened by mutual 

 pressure. 



Sub-family.— CORYPHELLID^. 

 Genus. — Coeyphella. 

 Coryphella gracilis, A. & H. 



Eolis ( Coryphella) gracilis, A. & H. 



Found frequently in the spring of 1895 under stones on the 

 shore near Knightstown and at Dohilla. 



Coryphella Landsburgii, A. & H. 



Folis ( CoryphellcC) Landshurgii, A. & H. 



This widely-distributed species was dredged on two occasions 

 onlv in Valencia Harbour in 1895 : not at all in 1896. 



