76 polyceridjE. 



fond of swimming on the surface of the water in the usual 

 inverted position. It is the Doris flava of Montagu, Polycera 

 ornata of D'Orbigny, P. lineata of Bisso, and P. typica of 

 Thompson. 



2. P. ocella'ta, Alder and Hancock. 



P. ocellata, A. & H. in Ann. N. H. 1st ser. ix. p. 33 ; and Brit. Nud. Moll, 

 fam. i, pi. 23. 



Body rather stout, greenish-black, with large tubercular 

 whitish spots : mantle with a whitish free margin, tuberculated 

 or scalloped, forming a bilobed veil, interrupted in front, and 

 continued along the sides of the back to the branchial appen- 

 dages, which are lobated and slightly branched : dorsal tenta- 

 cles rather long, conical, broad and smooth below ; the lami- 

 nated portion rather short, greenish, tinged with reddish- 

 brown : head semicircular : gills 5, bipinnate, greenish-white 

 tinged with brown. L. 0*5. 



Habitat : Under stones in pools between tide-marks ; pretty 

 generally distributed, but not common. [Kiel Bay, Little 

 Belt, Samsoe, and Heligoland (Meyer and Mobius.)] 



3. P. Lesso'ni, D'Orbigny. 



P. Lessonii, D'Orb. in Mag. de Zool. vii. p. 5, pi. 105 ; A. & H. Brit. Nud. 

 Moll. fam. 1, pi. 24. 



Body stout, green or yellowish, with yellow tubercles : 

 mantle with a narrow free margin, set with strong ye] low 

 tubercles, and forming a bilobed veil, interrupted in front, and 

 continued along the sides of the back to the lobated and 

 clustered branchial appendages : dorsal tentacles short, clavate, 

 and laminated for two-thirds of their length : head angulated : 

 gills 3, bipinnate. L. 0-5. 



Habitat : In deepish water in the coralline zone ; generally 

 found feeding upon Gemellaria lorkata. More local than the 

 last. Cullercoats, not uncommon ; Dublin Bay, rare (Alder) ; 

 mouth of the Dee, Cheshire (Byerley). [Moray Firth (Gor- 

 don).] 



P. Lessoni was first found on the French coast by D'Orbigny, 



