174 



Dr. Johnston on the Irish Annelides. 



I have also scarcely a doubt of this being the Nereis mar- 

 garitacea of Leach (Supp. Encyl. Brit. i. p. 451. pi. 26.), but 

 Dr. Leaches character of the species is entirely generical ; and 

 Savigny and Milne-Edwards and Audouin have particularly 

 described a Nereis margaritacea, which is not the same with 

 the one before us, but more nearly related to N. viridis. 

 Neither has this any relation to the Nereis margaritacea of 

 the ' Annals,' vol. iii. p. 294, which belongs to a different sec- 

 tion of the genus. 



4. N. bilineata. 



I have nothing to add to the character and description of 

 this species given in the 'Annals,' iii. p. 295. It does not 

 occur in the Irish collection. 



5. N. Dumerilii, post-occipital segment equal in length to 

 the second ; tentacular cirri 3 times longer than its breadth ; 

 jaws serrulated; branches of the mid and posterior feet widely 

 separate, the lobes papillary, divaricate ; superior cirrus pro- 

 jecting far beyond the apex of its lobes. Aud. and Edw. Litt. 



de la France, ii. p. 196. 



Fig. 5. 



Nereis Dumerilii. 



