Fam. 3, Plate 30. 



EOLIS AMCENA, Alder and Hancock. . 



E. gracilis, virescenti-alba, brunneo notata, punctis albis : branchiis ' viridibius, luteo-maculatis, in 

 seriebus 8 digestis, quorum 3, contiguse et 5 remotse sunt : tentacuRs xlorsalibus longis, brunneo -cinctis : 

 lateribus anterioribus pedis rotundatis. A 



Eolis amcena, Aid. and Hanc. in Ann. Nat. Hist. v. 16, p. 316. 



Hab. Dredged in Torbay. , 



Body about three lines long, slender, nearly linear, terminating bemncfin a fine point ; of 

 a greenish, white, tinged with yellow from the viscera appearing through ; on the back are a few 

 dark brown markings. The head and shoulders are sprinkled with opake white tubercles, and 

 there is a faint streak of white on the tail. Dorsal tentacles long, linear, wrinkled, 

 pellucid, slightly tinged with green and thickly spotted with white near the top : about one 

 third down they are encircled by a dark brown band. They are set rather close together at 

 the base, and held nearly parallel : the eyes are rather small and situated close behind them. 

 Oral tentacles about half the length ofi the dorsal ones, linear, arising from the upper surface 

 of the lips, whitish with an imperfect brown band in the centre ; the tips obtuse. Branchia 

 arranged in eight transverse rows on each side, the three anterior ones close together, the 

 others wide apart. The first row contains" three small papillae, most of the others have four 

 papillae each; those next the back longest, the outside ones very small. They are large, 

 linear, slightly elliptical, and pointed above, standing up in a fan-like manner across the 

 back : the central vessel is of a pale warm * green, and nearly fills the sheath, which has a 

 brown ring at the base and some pale freckles of the same colour apparently arranged in 

 three belts above ; the surface is likewise freckled with pale opake yellow spots, crowded 

 near the top, where they form an indistinct ring : the tip is transparent. The gastric vessel is 

 seen of a green colour through the skin on the centre of the back, with branches along the 

 base of the papillae. Foot very narrow, linear, the anterior margin slightly bilobed and a 

 little widened and rounded at the sides : the tail terminates a short way behind the 

 branchiae. 



So nearly do the species of this genus approach each other, that it is often difficult to 

 point out the characters by which they may be distinguished. A difficulty of this kind 

 occurs to us in comparing this lovely little species with the JEolis (Montagua) viridis of 

 Forbes. There are several small differences in colour and markings, but perhaps the best 

 distinguishing characters are to be found in the close approximation of the first three rows 

 of papillae in E. amcena, and the brown markings on the back. The tubercular nature of 

 the spots on this little animal is different from anything we have before observed in the 

 genus. This species is also nearly allied to E. Northumbrica, from which, in addition to the 



