18 CATALOGUE OP THE MOLLtJSCA 



Among the rocks near low-water mark ; not rare. Cullercoats 

 and Whitley. 

 3. P. LESSONii, nOrh. 



Polycera Lessonii, D'Orb. in Mag. de Zool. vii. 5, t. 105. 

 Polycera citrina, Alder in Ann. Nat. Hist. vi. 340, t. 9, 

 f. 7-9. 

 On Gemellaria loriadata, in from 15 to 20 fathoms water ; 

 common. Cullercoats. — J. A. and A. H. Whitburn. — Mr. R. 

 Howse. 



9. ANCULA, Lovin. 



1. A. CEISTATA, Alder. 



Polycera cristata, Aid. in Ann. Nat. Hist. vi. 340, t. 9, f. 



10,11. 

 Ancula cristata, Aid. and Hanc. Mon. Nudib. Moll., fam. 1, 

 pi. 25. 

 Among the rocks at Cullercoats and Whitley ; common, 

 Newbiggin. — /. A. Marsden. — A. H. Holy Island —Dr. John- 

 ston. 



10. ID ALIA, Leuckart. 



1. I. ASPEKSA, Aid. and Hanc. 



Idalia aspersa, Aid. and Hanc. Mon. Nudib. Moll., fam. 1, 

 pi. 26. 



One specimen found on Fusus antiquus from the fishing boats, 

 Cullercoats. — J. A. 



2. I. ELEGANS, Leuck. ? 



Body convex, white, tinged with flesh colour ; tentacles long 

 and slender, with 4 long tentacular filaments in front, 2 at the 

 base of each tentacle ; lateral filaments 6 on each side, very long, 

 the last bifid : there are also 3 rows of filaments on the back ; 

 the central one containing 3, the sub-lateral ones 5 each. Bran- 

 chiae, consisting of 11 slender pinnate plumes, largest in front, 

 and becoming very small behind ; the anterior plume is bifid. 

 Length, half an inch. 



An individual of this species was obtained by the Rev. G. C. 

 Abbes from the fishing boats at Whitburn. It is similar to a 

 specimen from Torbay, preserved in the British Museum, and 

 labelled Idalia elegans, by Dr. Leach. There may be some 



