Fam. 3, Plate 20. 



EOLIS LANDSBURGII, Alder and Hancock. 



E. gracilis, violacea : branchiis elliptico-linearibus, aurantiaco-rubris, apicibus albus in fasciculis 

 5-6 digestis : tentaculis linearibus violaceis, apicibus albis : angulis anterioribus pedis paululum 

 productis. 



Eolis Landsburgii, Aid. and Hanc, in Ann. Nat. Hist. v. 18, p. 294. 



Hab. Among rocks at Saltcoats, Ayrshire, rare, D. Landsborough, Esq. 



Body three tenths of an inch long, very slender, and of a beautiful violet or amethyst 

 colour. Dorsal tentacles moderately long, slender, linear, violet tipped with yellowish white. 

 They are set a little apart at the base ; the tips widely separated, and not much inclined 

 forwards. The eyes are placed rather far behind them. Oral tentacles a little longer than 

 the dorsal pair, and of the same colour : they form a continuous outline with the sides of the 

 head, as in Eolis coronata. Branchice rather short and stout, nearly linear or slightly 

 elliptical ; the central gland of an orange red, not granular ; the sheaths rather wide, pale, 

 transparent violet, with a ring of white at the apices. They are set down the sides of the 

 back in five or six clusters : the first containing from eight to twelve papillae ; the second from 

 six to nine ; and the others fewer, as they approach the tail. Foot of a yellowish hue down 

 the centre, with the margins of a pale violet ; very narrow, arched in front, with the lateral 

 angles acute, but not much produced ; terminating in a fine point behind, a little way beyond 

 the branchiae. Mouth very small and nearly circular. 



Of this charming little Eolis only one specimen has yet been found, which was discovered 

 at Saltcoats, in June 1846, by Mr. David Landsborough, Junr., who obligingly transmitted 

 it to us alive. The beautiful and delicate amethystine colour of the body distinguishes it 

 from all the other British Eolides. We have named it after its discoverer. 



Eolis Landsburgii is rather an active animal, but it makes very little progress when 

 floating at the surface of the water, probably on account of the narrowness of the foot. 

 When the specimen came into our possession, several of the papilla? had fallen off, but in the 

 course of a few days new ones made their appearance, and, in two or three days more, had 

 attained considerable size. 



Figs. 1, 2, 3. Eolis Landsburgii, different views. 



4. Two of the papillse more highly magnified. 



