Fam. 1, Plate 27. 



Figs. 1 to 4. 

 IDALIA ELEGANS, Leuckart. 



I. rosea, maculata; filamentibus margine palliali numerosis, aurantiacis apicibus flavis, posticis 

 brevibus lobatis, anticis 2 elongatis, filamentibus dorsalibus 5; branchiis 18 elongatis; pede magno, 

 luteo marginato. 



Idalia elegans, Leuck., Breves Anim. Desc., p. 15, f. 2. 



laciniosa, Phil., Enum. Moll. Sic, v. 2, p. 77, pi. 19, f. 5. 



Hab. Dredged in fifteen fathoms, St. Peter's Port, Guernsey, /. A. 



Body an inch and a half long, rather stout and elevated on the dorsal area, pale rose- 

 coloured, freckled with darker spots of the same colour. Tentacles rather long, linear, 

 minutely laminated on the upper portion for about two-thirds down : the base of each tentacle 

 is rose-coloured, above which it is white spotted with red ; the upper part is deep rose-coloured 

 to nearly the apex, which is bright yellow. The pallial ridge is much expanded, and forms 

 a more distinct cloak than we have met with in any other species of the genus; it has two 

 long, rather stout and tapering filaments in front, — one near the base of each tentacle : the 

 lateral filaments are numerous ; two or three of the anterior ones are of moderate length, the 

 rest short and rather irregular, becoming broad, obtuse and lobated at the sides of the branchiae ; 

 they are all of a brilliant orange colour with yellow tips. There are also five stout papillae 

 on the back, — three down the central line, and two sublateral in front of the branchise ; they 

 are freckled with rose-colour below, and yellow above. Branchial plumes eighteen, the anterior 

 and posterior ones bifid, for nearly their whole length, rather large, simply pinnate, arising 

 from an elevated base, and diminishing gradually from front to back, forming a complete 

 circle : they are rose-coloured, spotted with a darker shade of the same colour, and become 

 bright yellow towards the apices : the general base is pale. Head broad and thick, sloping 

 gradually down from the tentacles, and having a slight \ elar expansion over the mouth : its 

 colour is white, with a minute freckling of pink above, and a yellowish tinge towards the 

 e^ge. Foot very large, spreading and undulating at the margin, which is usually turned a 

 little upwards : it is white with a freckling of rose-colour towards the upper part, and down 

 the posterior ridge to the tail. The margin has a border of bright orange with a yellow edo-e : 

 the underside is white, with a darker shade in the centre from the liver : the front angles are 

 rounded, and the posterior extremity rather obtusely pointed. 



We can scarcely doubt that this is the Idalia laciniosa of Phillippi ; the specimen from 



