of Great Britain. 113 



A variety of this shell, found near Edinburgh, is entirely without 

 keel. PI. turgidus, Jeff, is also a variety of this. 



3. Carinatus, Mull. 



4. Disciformis, Jeff. 



I am not very sure, even after the examination of Mr Jeffreys's 

 specimens, that I perfectly understand the distinction between this 

 and the preceding species. The degree of carination is so very va- 

 riable in different individuals of the same species, that it is rather 

 fallacious as a distinguishing character. Further observations on 

 this species are desirable. 



5. Vortex, Mull. 



6. Spirorbis, Mull. 

 7- Lcevis, Aid. 



Besides the localities in Northumberland mentioned in the New^ 

 castle Natural History Society's Transactions, this species has been 

 found in Ireland by W. Thompson, Esq. of Belfast, and there are 

 specimens (unnamed,) in the Museum of the Jardin des Plantes at 

 Paris from Granville ; so that, though it has remained so long 

 unnoticed, its range is considerable. 



8. Deformis, Lam. 



PI. Spirorbis, Drap. 



PI. Draparnaldi, Shep. Jeff. 



PI. complanatus, Turt. 

 First introduced into our Fauna by the Rev. R. Sheppard, who 

 found it in Suffolk. A specimen in my cabinet, from the reject- 

 ments of the sea near London, was submitted to the inspection of 

 Dr Turton, who pronounced it to be of this species, and only the 

 third he had seen, the two others being in his own cabinet. These 

 latter I do not recollect to have seen in the possession of Mr Clark. 

 Concerning my own specimen, there is considerable doubt whether 

 it be in fact anything more than a variety of PI. albus. It is a dead 

 and unbleached shell, with a slight marginal keel, but exhibiting faint 

 traces of spiral striae under a magnifier. Mr Jeffreys has two spe- 

 cimens, also dead shells, which he refers to this species. They are 

 from the rejectments of the river Taaf, near Cardiff. PI. compla- 

 natus of Turton's Manual appears to be this species, though he 

 makes no reference either to Draparnaud or Lamarck. It is rare in 

 the collections of French naturalists. Pfeiffer makes PI. deformis, 

 Lam. a variety of PI. albus ; but Ferussac considered it distinct, and 

 called it PI. acronicus. It is desirable that it should be observed in 

 a living state. 



9. Albus, Mull. 



Var. PI. glaber, Jeff. 

 An examination of Mr Jeffreys's specimens of PL glaber confirms 



