TELLIXA. 385 



south and west of England, Wales, Ireland, and west 

 of Scotland, from 7 to 15 fathoms; Dunbar (Laskey). 

 The last-mentioned locality has been designated the 

 " hotbed " of our spurious Mollusca : it is notorious 

 that much confusion originated in species having been 

 formerly stated to be found there, which are now ascer- 

 tained to belong only to tropical seas. Fossil in the 

 Kyles of Bute (Crosskey); Sicily and Tarento (Phi- 

 lippi) . It does not appear to have been found in the 

 north of Europe ; but its southern range is very exten- 

 sive, from the north of France to the iEgean (where 

 it is littoral), Madeira, the Canary Isles, and Azores, at 

 various depths not exceeding 49 fathoms. 



I have stated in the particulars of T. tenuis my reasons 

 for considering that species the T. incarnata of Linne. 

 He described it as a Swedish shell, but erroneously re- 

 ferred to Lister's figure of Psammobia Fe?Tdensis. The 

 present shell is not known as Scandinavian, and is at least 

 three times the size stated by Linne for his T. incarnata. 

 I believe the species which I have last described is 

 partly the T.planata of the ' Mus. Ulr. Reg/ and e Syst. 

 Nat.'; but as the latter name is now used for a larger, 

 although similar, Mediterranean shell, it may prevent 

 confusion by continuing the old name (squalida) pro- 

 posed by Solancler and adopted by Pulteney. It would 

 require a vivid imagination to suppose that this can be 

 the T. depressa of Gmelin, the meagre description of 

 which was taken verbatim from Gualtieri. Our shell has 

 certainly none of the colours there indicated, "nunc 

 Candida, nunc purpurascente, nunc subrosea." Gual- 

 tieri's wretched figures appear to represent two different 

 species ; and no habitat is given. Poli called the present 

 species T. incarnata, and Donovan T. depressa. 



