OF NORTHUMBERLAND AND DURHAM. 57 



band in front of the foot by which our species is distinguished, 

 and his description altogether corresponds more nearly with that 

 of L. rudissima. 



Philippi enumerates seven synonyns of this species, without 

 taking into account our English name, and the Turbo neritoides 

 of Linnaeus with which he is now inclined to indentify it. 



The Turbo ziczac found by Lady Wilson near Sunderland, 

 and stated to diifer from the West Indian specimens in wanting the 

 ziczac markings, is most likely only a variety of this species ; at 

 least a specimen so named in the cabinet at Wallington, which 

 we had the opportunity of examining through the kindness of 

 the late Sir John Trevelyan, Bart., certainly belongs to L. 

 petrcea. 

 6. L. RETUSA, Lam. 



Nerita littoralis, Mont. Test. Brit. 467. 



Littorina neritoides, Johns, in Berw. C. Proc. i. 269. 



On sea-weeds, among the rocks near high-water mark, common. 



The Turbo retusus and T. neritoides of Lamarck, are un- 

 doubtedly only different forms of the JVerita littoralis of Lin- 

 naeus, as we have satisfied ourselves by an examination of the 

 Lamarckian specimens. As T. neritoides, Linn., is not considered 

 to belong to this species, we adopt the former name. T. obtu- 

 satus, Linn., we are assured by Mr. Hanley, is distinct. 



The Turbo aureus of Brown (Conch. lUust. 2nd Ed. 17, t. 10, 

 f. 23), found by Sir Walter C. Trevelyan, Bart., at Seaton, Nor- 

 thumberland (qu. Durham ?), is referred in the appendix to the 

 genus Margarita, and in the description of the plates is called a 

 Littorina. We think it scarcely belongs to either of these 

 genera. 



51. LACUNA, Turton. 



1. L. PALLiDULA, L)a Costa. 



Nerita pallidida, Mont. Test. Brit. 468. 

 On sea-weeds between tide-marks, not uncommon. 



2. L. PUTEOLA, Turt. 



Lacuna puteola, Turt. in Zool. Jour. iii. 191. 

 On sea-weeds and in shell-sand, rather rare. 



