1910.] AND NUDIBRANCHS OF BERMUDA. 141 



the same as the other individuals collected at this time, but the 

 bluish ground-colour was entirely wanting. The following colour 

 differences were conspicuous. The foot was white with no blotches 

 or spots of any colour. The protrusible proboscis was entirely 

 white. The rhinophores were of a light brown tipped with white. 

 The collar of the branchial plumes showed an absence of colour, 

 as did the back of each plume, so far as any ground-colour was 

 concerned, a few spots of orange only remaining. The gills were 

 colourless. The remainder of the body was streaked and mottled 

 with a bright orange, but between these orange spots there was 

 an entire absence of the usual ground-colour. Even in a preserved 

 state, this albino can readily be distinguished from specimens 

 which have the usual ground-colour of blue. 



Facelina agari, sp. n. (Text-fig. 9.) 



It is impossible to be certain to which of the Eolidae this species 

 belongs, because only a single specimen was found, and the 

 differences between the several subdivisions are so slight that a 

 critical study of the morphology of a new species is necessary 

 before one can feel certain where to place it. This form resembles 

 Facelina bostoniensis more than it does any other one of the 

 Eolida3 that I have thus far examined ; but F. bostoniensis is 

 referred to by Bergh (92, pp. 36, 40) under the name Corphella 

 as well as Facelina. This seems to indicate that there is a con- 

 siderable difference of opinion in reference to F. bostoniensis, and 

 the same is true of several other forms. As soon as I can obtain 

 more animals of this species, I hope to work out its anatomy in a 

 critical manner, but until then I shall regard it as one of the 

 Facelinidae. This specimen was found under stones on the shores 

 of Agar's Island, on which the Bermuda Biological Laboratory is 

 located ; so it seems appropriate to give it the specific name 

 agari. 



The body is long and slender — 30 mm. long and 2 mm. wide. 

 The rhinophores are club-shaped with conical tips, slightly con- 

 tractile, and covered, except at the tip and base, with numerous 

 small blunt tubercles. The presence and the shape of these 

 tubercles on the rhinophores are a distinguishing characteristic of 

 this form, and make one hesitate to place it in the genus Facelina, 

 where the rhinophores are usually slender and perfoliate ; how- 

 ever, this latter character is not a constant one. 



The head is rounded, narrow ; the tentacles occupy the sides of 

 the head, and are conical, small in diameter, and longer than the 

 rhinophores. Their surface is irregularly roughened. The foot 

 is rounded anteriorly and bears a pair of distinct, angular, auricu- 

 late processes, which at first are easily mistaken for a second 

 pair of head-tentacles. They are the foot-tentacles. The foot 

 gradually tapers behind to a sharp point, the least bit of which 

 can be seen posterior to the waving branchiae. The foot is 

 colourless and wider than the body. 



The branchiae are numerous and arranged along each side of the 



