prestwich ckag-t5eds of suffolk and norfolk. 493 



Land and Freshwater Shells. 



Names of Species. 



Synonyms and 

 critical remarks. 



Greographical 

 Distribution. 



Localities 



in 

 Red Crag. 



Localities 



in Norwich 



Crag. 



107. 

 104. 



108. 



7. 



8. 

 109. 

 108. 



109. 



9. 



111. 



10. 



9. 



6. 



5. 

 112. 



Cyclas cornea 



Cyrena consobrina 



Pisidium amnicum 



Carych 



lum minimum 



Helix arbustorum. 



■ hispida 



flebeium ... 



pulchella ... 



Limnsea palustris 



peregra 



Paludestrina (?) pendula 

 subumbilicata 



(?) terebellata .... 



Paludina lenta 



tentaculata 



Planorbis complanatus . 

 corneus 



spirorbis 



Pupa marginata, Dra^par- 



naud. 

 Succinea oblonga 



putris 



Valvata piscinalis - 

 cristata 



Sphserium corneum 

 Corbicula fluminalis, 

 Mull. 



H. hispida, var 



H. rufescens, var.?... 



P. terebellata, var.... 

 Hydrobia ventrosa, 

 Mont. 



G. Bythinia 



Europe, Asia ... 

 Asia 



Europe, Asia, 



N. Africa, N. 



America. 

 Europe, Asia, 



N. Africa. 

 Europe, Madeira 

 Europe, Asia . . . 



N.America 



Europe, Asia, 



N. Africa. 

 Europe, Asia, N. 

 Africa,Madeira 

 Europe, Asia, 



N. America. 

 Europe, Asia . 



Europe, Asia . . . 



Asia 



Europe 



Europe, Asia . . 

 Europe, Asia, 



N. Africa. 

 Europe, Asia, 



Iceland. 

 Europe, Asia, 



N. America. 

 Europe, Asia, 



N. America. 

 Europe, Asia, N 



& S. America. 

 Europe, Asia . . . 

 Europe, Asia . . . 



Wd 



'^' ..... 



WWd 



Bt 



Bt 



w 



S WBt 

 Wd 



Bt .'.'.'.. 

 Bt 



Br T Bl E 

 Br Bl E 



Br T E Bl 



Br 



EN 



Br TBI 



NBl. 



Br 



BrBl 



BrE 



Br 



Br T Bl Th 



BrBl 



BrBl 



Bl 



BrBl 



Br 



Bl 



Br 



Br 

 Br 



Since the preparation of the Lists of MoUusca appended to my 

 papers on the Coralline and Eed Crags, Mr. Alfred Bell has published, 

 in the ' Annals and Magazine of Natural History ' for September 

 1870 and May 1871, considerable additions to the Crag-fauna. As 

 regards the Mollusca, several had been previously communicated by 

 him to Mr. Jeffreys, who examined the specimens ; these are incor- 

 porated in the above lists. Others have not undergone the same 

 revision. The names of all the species described by Mr. BeU as new 

 are here subjoined, with the critical remarks of Mr. Jeffreys as to 

 those of which he has examined specimens. 



