Fam. 3, Plate 25. 



EOLIS NANA, Alder and Hancock. 



E. ovato-oblonga, luteo-alba ; branchiis subclavatis, roseis, apicibus albis; in seriebus 8-10 

 approximatis digestis : tentaculis dorsalibus laevibus : lateribus capitis dilatatis, rotundatis': angulis 

 anterioribus pedis obtusis. 



Eolis nana, Aid. and Hanc, in Ann. Nat. Hist. v. 9, p. 36. 



Hab. Under stones between tide-marks. Whitley and Cullercoats, not common. 



Body about four lines long, ovate oblong, flattish, tapering to an obtuse point behind ; 

 of a pale buff colour on the back, the head and tentacles transparent white. Dorsal tentacles 

 moderately long, linear, smooth, tapering towards the extremities, and approximating below : 

 they are carried nearly erect. Oral tentacles a little shorter than the dorsal pair, nearly 

 linear, pointed. Head broad, rounded, and projecting at the sides considerably beyond the 

 insertion of the oral tentacles. Branchice subclavate ; the central vessel rose-coloured, and 

 conspicuously sprinkled with dark granules ; the sheaths wide, with the opake part near the 

 apex of a faint white, and extending rather further down than in most of the other species. 

 The papillae are disposed in eight to ten close transverse rows of five or six each along the 

 sides, leaving a bare space on the back, reaching nearly to the tail. A few papillae extend 

 along the sides of the head in advance of the dorsal tentacles. Foot transparent white, rather 

 short, and obtuse behind ; the front rounded, and scarcely angulated at the sides. 



This species is readily distinguished from most of those with red branchiae by having the 

 papillae in close continuous rows, and not arranged in tufts. It holds an intermediate station 

 between the divisions of the genus, agreeing with the first section in its broad and 

 flattened form, as well as in the general arrangement of the papillae ; its colour and the 

 armature of the tongue ally it to the second section ; while the auditory capsule, containing 

 only a single otolithe, and the character of the spawn, seem to indicate its place in the third 

 section of the genus. 



An individual kept in a glass of sea-water showed great restlessness, frequently moving 

 with considerable speed in all directions. Its sensitiveness was equal to its activity ; the least 

 agitation of the water causing it to contract its body backwards, and to draw its head and 

 tail together until the whole foot was detached from its hold, and it fell to the bottom of the 

 glass. This restlessness, common to a portion of the genus, renders the task of delineating 

 them rather a difficult one. 



We have not yet met with this species beyond the Northumberland coast, and there it is by 

 no means common, and rather uncertain in its appearance. It is found further above low- 

 water mark than any other of the fgenus with which we are acquainted, and most frequently 



