140 



REPORT — 1839. 









Table I. 











GENERA. 



I. 



II. 



III. 



IV. 



V. 



VI. & VII. 



VIII. 



IX. 



X. 



Limax 



3 



6 



4 



6 



3 



6 



6 



2 



2 



Testacellus... 



1 



1 



1 











1 















Vitiina 



1 



1 



1 



1 



1 



1 



I 



1 



1 



Helix 



14 



1 



32 



29 

 2 



33 



24 



1 



28 



1 



24 

 2 



16 



1 



1 

 



Succinea .... 



Bulimus 



1 



2 



3 





2 



2 



1 



1 







Achatina 



1 



2 



2 





2 



2 



2 



1 







Acme 



— 



1 

 1 



1 



1 





1 

 1 



1 











1 





 





 



Azeca 



Pupa 



9 



9 



10 





8 



9 



q 



^ 







Clausilia 



1 



4 



3 





2 



2 



1 



I 







Balea 



1 



1 



1 





1 



1 



1 











Carychium... 



— 



1 



1 





1 



1 



1 



1 







Limneus . ... 



2 



7 



4 





6 



6 



6 



2 



1 



Planorbis ... 



1 



10 



9 



10 



8 



10 



10 











Physa 







2 



2 



2 



2 



2 



2 











Ancylus 



Total ... 



1 

 30 



2 



2 



2 



2 



2 



2 



1 







83 



76 



82 



65 



75 



69 



30 



5 











Table 



[I. 























Rocks 



in order of their 



Influence. 



S 





.S 



.><• 





3 





<u 



i 



i 





i 



E 



_3 

 IS 



c 

 S 



(3 



S 

 >» 



3 



vi 



§ 





h4 



H 



> 



w 



1 



3 



2 



< 

 1 



< 



Cu, 



4 



eq 

 1 



(J 

 1 



h4 

 7 



10 



Oh 



2 



<5 

 2 



H 



Cretaceous and ) 

 Oolitic 5 



6 





1 



29 



81 



Carboniferous } 

 Rocks and Trap J 



6 





1 



28 



2 



2 



2 



1 



1 



12 



3 



1 



1 



6 



9 



2 



2 



80 



Tertiary 



5 





1 



26 



1 



2 



2 



1 







7 



3 



1 



1 



7 



10 



2 



2 



72 



Saliferous 



4 



4 





1 



1 



25 



18 



1 

 1 



1 

 2 



2 



1 



1 







8 

 2 



3 



1 



1 



1 



1 

 1 



6 

 3 



7 

 5 



2 



1 



2 



1 



65 

 44 



Slates 



Granite & Gneiss 



3 





1 



18 



1 



1 



1 











2 



1 



1 



1 



2 



1 







^ 



35 



III. — 0;2 the relations of the British Pulmoniferous MoUusca 

 to those of Europe generally, and the distribution of the 

 more remarkable species. 



To compare the distribution of Pulmonifera in Britain with 

 their distribution on the Continent, or even to ascertain the 

 European range of British species, is by no means an easy 

 task. The difficulty chiefly arises from the want of agreement 

 between the writers of different countries. Almost every land 

 and fresh-water shell has half a dozen synonyms, and every 

 local catalogue presents us with names (not species) peculiar 

 to itself. The habit of changing names, — I had almost said, — 

 wantonly, — has been indulged in to an unwarrantable extent 

 among Malacologists, especially writers on the order of ani- 



