228 



feeding upon Nuphar lutea, such water plants as Pota- 

 mogeton, and decaying leaves. 



M. Bouchaud Chautereaux says it lays from ten to 

 thirteen eggs, which hatch in twelve days. 



The variety glaher, of Jeffreys, is without sirice. 



Specimens have been received from Dilston, sent by 

 Mr. Alder, from Scarborough by Mr. Bean, and from 

 Penzance by Mr. Millett. Those from Scarborough 

 are freer frem strioe and not so broad as those found in 

 this neighbourhood. 



Our habitations of this shell are the lake at Highfield 

 House, a clear brook at Radford, another at Oxton 

 and the river Trent on algce, near Beeston Ryelands, 

 where it is rare. 



Other localities are—Penzance (Millett), Brisfol 

 (Miller), Wiltshire (Montagu), Swansea (Bate), Nor- 

 wich, scarce (Bridgman), London (Grey), Essex (Shep- 

 pard), Battersea (Jeffreys), Stone, Buckinghamshire 

 (Reade), Kendal (Gough), Blackpool, scarce (The 

 Author), Newcastle (Alder). 



Scotland (Laskey), Ireland (Brown), Isle of Man 

 (Forbes), Germany (Pfeiffer), and Sweden (Nilson). 



Planorbis nautileus [The Nautilus Coil Shell]. 

 LinncEus. 



Figure 92. 

 92. 



Better known as the Planorbis imbricatus of Grey 



