Fam. 3, Plate 13. 



EOLIS DRUMMONDI, Thompson. 



E. albida, branchiis elongatis, sub-linearibus, rufescentibus, apicibus albis, in fasciculis 4-6 

 digestis : tentaculis dorsalibus dense annularis, annulis 20-30 : tentaculis labialibus longis : angulis 

 anterioribus pedis valde productis, acuminatis. 



Eolidia rufibranchialis, Thompson, in Ann. Nat. Hist. v. 5, p. 89. 



Eolis Drummondi, Idem in Report Brit. Assoc, for 1843, p. 250. 



Var. Eolis tenuibranchialis (?), Aid. and Hanc. in Ann. Nat. Hist. v. 16, p. 3] 5 ? 



Hab. Under stones between tide-marks, and in shallow water : not uncommon in the north of 

 Ireland, and on the Western Coasts of Scotland and England. Belfast Lough, plentiful, Dr. 

 Drummond, and W. Thompson, Esq. Rothesay, Isle of Bute ; Lamlash, Isle of Arran ; Ardrossan and 

 Saltcoats, Ayrshire ; frequent, /. A. Birkenhead, /. Price, Esq. Dredged near South- Sea Castle, 

 Portsmouth, Capt. James, R.N. 



Body from an inch to an inch and a half in length, rather broad, and spreading a little 

 at the sides ; of a transparent watery white, with a shade of yellow or flesh-colour, becoming 

 deeper towards the head, which is large and generally of a rosy flesh-colour, with a little 

 opake white immediately in front of the dorsal tentacles, and a delicate streak of the same 

 passing between them ; there are also a few spots of opake white over the heart. Dorsal 

 tentacles approximating at the base, long and linear, but capable of great contraction, of a 

 rosy fawn colour with opake white or yellowish tips, and a streak of the same passing a little 

 way down in front : they are covered to near the base with numerous rings,— about twenty 

 or thirty in number — some of which are narrower than the rest. Oral tentacles very long, 

 sometimes in young individuals extending nearly half the length of the body ; broad at the 

 base, and tapering to a point ; tinged with the same colour as the head, with usually a streak 

 of opake white towards the tip. Branchice numerous, long, linear, a little broader in the 

 middle, and tapering to a point at the apex ; set down the sides of the back in from four to 

 six clumps : the first large, and generally containing thirty or forty papillae, arranged in seven 

 transverse rows, the largest containing about six each ; the remaining clumps grow gradually 

 less numerous, and the last comes very near to the tail, so that the papillae extend beyond it 

 when the animal is at rest. They are of a reddish brown colour, varying to dull red, brown 

 drab, and yellowish brown in different individuals ; the coloured portion is slightly granular, 

 and forms a rather narrow central line with undulating edges, the transparent white sheath 

 appearing of equal breadth to it on each side. There is a ring of opake white near the top, 

 which extends down into an angle in front, and is occasionally interrupted behind. The tips 

 are transparent. Foot broad and thin, transparent white, the front angles produced into long, 

 pointed tentacular processes. It is strongly grooved, and doubly arched in front, and tapers 

 rather abruptly to a point beyond the branchiae posteriorly. 



