100 



Montagu was acquainted with this shell, but had not 

 fixed it as a distinct species. At page 336 of his 

 Testacea, in describing the Turbo Muscorum, he 

 observes, " that in company with it is sometimes 

 found, what must at present be considered as a 

 variety : it is not above half so large, with the 

 same number of volutions, and is exactly similar 

 in shape, but the aperture is not marginated, and 

 it is always destitute of the tooth." 



And as this, and perhaps some other distinct species, 

 may be passed by as the young of Pupa umbilicata, 

 it may be proper to point out, that the unformed 

 shell of the last-mentioned species may in every 

 stage of growth be distinguished by a fine white 

 laminar line, in the middle of the mouth, which 

 worms round the volutions to the very apex. 

 This line is a continuation of the tooth, and may 

 also be observed in the young of the Vertigo an- 

 glica. 



It is very probable that this is the true Turbo Mus- 

 corum of Linne, as it most accurately answers his 

 description in the Sy sterna Natura. " Testa ovata 

 obtusa pellucida, anfractibus senis secundis, aper- 

 tura edentula." 



In woods, under stones, not uncommon. 



