IDALIA. 79 



stout peduncular base, diminishirig 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 

 Comet, Guernsey ^Alder). Mr. Barlee also met with it in 

 Birterbuy Bay, Connemara. [Devon and Cornwall (Spence 

 Bate).] It inhabits the Mediterranean, where it was fii'st met 

 with by Leuckart. It is the I. laciniosa of Philippi. 



This briUiant and very beautiful jS'udibranch 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. 



/. LcacJdi, A. & H. Brit. Nud. MoU. fara. 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 thi-ee 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 fieshy. L. 1. 



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

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

 (Barlee). [Shetland (Norman).] 



B. Centre of the hack ivWiont Jilaments. 

 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 inconsiDicuous, 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 



