uoRis. 93 



C. Qilh united at the hase, non-retractile : hocly convex : oral 

 tentacles indistinct, united into a veil : odontojjhore narrow. 

 (Acanthodoris, Gray.) 



--21. D. piLo'sA, Miiller. 



D. pilosa, Mini. Zool. Dan. iii. p. 85, f. 5-8 ; A. & H. Brit. Nud. Moll, 

 fam, 1, pi. 15. 



Body ovate, very convex, subpellucid ; colour various, white, 

 yellow, brown, freckled or blackish: mantle with slender 

 pointed papilloe : dorsal tentacles long, slightly bent backwards, 

 retractile within small denticulated sheaths : 07Yd tentacles in- 

 distinct, expanded into a veil at the sides : gills 7-9, large 

 and spreading, transparent white or greyish, generally with 

 opaquo-white midribs, which form a star in the centre. 

 L. 0-5-1-25. 



Habitat : Within tide -marks or in shallow water ; com- 

 mon on nearly all parts of the British coast. It occurs on 

 the northern and western shores of France, as well as in 

 Holland, [Denmark,] Sweden, and Norway. [Faroe (Morch) ; 

 ^Egean, 13 f. (Forbes).] 



Do7'is jjilosa is extremely variable both in size and colour ; 

 in consequence of which several species have been made out 

 of it. The small white and blackish varieties are most com- 

 mon within tide-marks. The fine large white and canary- 

 yellow varieties are more local, and inhabit rather deeper 

 water in the laminarian zone ; but they are generally abun- 

 dant where they occur. The black variety is the D. nigra of 

 Fleming and D. Flemingii of Forbes. Other synonyms for 

 this species are D. stellata, Gmelin ; D. suUcevis, Thompson ; 

 D. fusca, Loven ; and D. rosinela, Leach. 



22. D. quadrangula'ta, Alder and Hancock. 



I), quadranqulafa, A. & H. in Ann. N. H. 1st ser. xvi. p. 313 ; and Brit. 

 Nud. Moll. fam. 1, pi. 16. i. 1-3. 



Body white, subpellucid, rather elevated : mantle small, sub- 



