112 On the Land and Freak Water Mollusca 



Gen. 14. Vertigo, Muller. 



1. Edentula, Drap. Pf. 



V. nitida, F'er. 



2. Cylindrica, Fer. 



Pupa muscorum, Drap. 

 Since Mr Jeffreys's discovery of this beautiful little species on 

 Durdham Downs, Mr Forbes has met with it near Edinburgh, and 

 has also had it sent him from the west of Scotland. 



3. Pygmcea, Drap. 



4. Alpestris, (Fer.) Aid. 



Found at Clithero, Lancashire, by Mr Gilbertson ; and in Nor- 

 thumberland by Mr J. Thompson. 



5. Substriala, Jeff. 



Pupa sexdentata, Aid., Turt. 



6. Palustris, Leach. 



Pupa antivertigo, Drap. 



7- Pusilla, Muller. 



8. Angustior, Jeff. 



The difference between this species and the preceding appears 

 to be more in the number of teeth than the contour of the shell, 

 and if the former is permanent, it is undoubtedly the better charac- 

 ter of the two. 



Fam. Carychiadje, Jeff. 

 Gen. 15. Carychium, Muller. 

 1. Minimum, Mull. 



Gen. 16. Acme, Hartmann. 

 1. Lineata, Drap., Hart. 



Fam. Cyclostomid^e. (Cyclostomacea, Mencke.) 

 Gen. 17. Cyclostoma, Lamarck. 

 1. Elegans, Mull., Lam. 



C. Productum, Turt. is a foreign shell picked up in Ireland. 

 C. subcylindricum, Flem. is a marine species (Truncatella Mon- 

 tagui, Lowe, Zool. Journ.) C. truncatum, Jeff. I take to be the 

 same in a different stage of growth. 



•]--f- Fluviatile. 



Fam. LiMNEADa;, Jeff. (Les Limneens, F6r.) 



Gen. 18. Planorbis, Muller. 



1. Cornevs, Linn., Drap. 



2. Marginatus, Drap. 



var. PI. rhombaeus, Turt. 



