IDALIA. 79 



stout peduncular base, diminishing posteriorly, rosecoloured, 

 tipped with yellow : foot large, having an undulating margin, 

 bordered with orange -yellow. L. 1*5. 



Habitat : Two specimens were dredged in 15 f., near Castle 

 Cornet, Guernsey (Alder). Mr. Barlee also met with it in 

 Birterbuy Bay, Connemara. [Devon and Cornwall (Spence 

 Bate).] It inhabits the Mediterranean, where it was first met 

 with by Lenckart. It is the /. laciniosa of Philippi. 



This brilliant and verv beautiful Nudibranch has the curious 

 habit of taking up its abode in the test of an Ascidian. Both 

 the individuals dredged in Guernsey were so located. 



2. I. Lea'chii, Alder and Hancock. 



/. Leackii, A. & H. Brit. Nud. Moll. fam. 1, pi. 27. f. 5. 



Body elevated, white : mantle small, with four very long 

 and stout filaments in front of the tentacles, and seven others 

 (also rather long) on each side of the pallial margin, the last 

 bifid ; the dorsal area contains from three to five rows of fila- 

 ments of two to four each : dorsal tentacles long, rather stout 

 and tapering, finely laminated behind nearly to the base : gills 

 11, set on an elevated part of the back, diminishing posteriorly : 

 foot broad and fleshy. L. 1. 



Habitat : In rather deepish water. Torbay (Mrs. Griffiths) ; 

 Whitburn, Durham (Abbes); the Hebrides, and Birterbuy Bay 

 (Barlee). [Shetland (Norman).] 



B. Centre of the back without filaments. 

 3. I. aspersa, Alder and Hancock. 



/. aspersa, A. & H. Brit. Nud. Moll. fam. 1, pi. 26, and App. p. iv. 



Body ovate, reddish or yellowish, freckled with orange and 

 reddish-brown : mantle inconspicuous, forming a rather nar- 

 row dorsal area, with four very large and stout filaments in 

 front (two at the base of each tentacle) ; lateral filaments 

 short, two or three on each side near the gills : dorsal tentacles 

 long and tapering, finely laminated behind nearly to their 



