152 CARBONIFEROUS AND PERMIAN FORAMINFFERA. 



9. DISTRIBUTION TABLES. 



I. CARBONIFEROUS ENGLAND AND WALES (pp. 28 34; 153). 

 II. do. SCOTLAND (pp. 34 43; 154 156). 



III. do. IRELAND (pp. 43 ; 157). 



IV. do. BELGIUM (pp. 44, 45; 157). 



V. do. RUSSIA AND THE CAUCASUS (pp. 45 47; 158). 



VI. do. NORTH AMERICA (pp. 47, 48 ; 158). 



VII. PERMIAN ENGLAND, IRELAND, AND GERMANY (pp. 48 51 ; 159). 

 VIII. CARBONIFEROUS AND PERMIAN SUMMARY (pp. 160, 161). 



General Note. The columns of the Distribution Tables are, as far as practicable, 

 arranged in geological order, beginning at the lowest. In that referring to England and 

 Wales it has been needful to divide the table into geographical groups, in the absence of 

 data for correlating the beds of areas widely separated. The particulars as to geological 

 position are such as have been furnished by correspondents together with the material col- 

 lected from each locality. In some cases this information has been given with much more 

 detail than in others, and it is possible that strict geological order may have been dis- 

 turbed by defective information in one or two instances, but not to an extent to affect 

 the general accuracy of the arrangement. 



The NUMBER at the head of each column refers to the paragraph bearing the 

 corresponding number in the " Geological and Geographical " section, pp. 29 to 51. 



The occurrence of each species is marked by a cross (X). 



As already stated, the condition in which the minute fossils of the Carboniferous beds 

 are found is often such as to render identification difficult. When much surface- 

 corrosion has taken place the specimens have, as a rule, been thrown aside, but when it 

 is present to an extent only sufficient to throw doubt on the determination of the exact 

 species the occurrence is marked in the tables by a note of interrogation (?). In some 

 columns referring to rocks either of subcrystalline texture (like the Calcaire de Namur in 

 the Belgian Table), or containing iron-compounds the oxidation of which disintegrates 

 calcareous shells, such entries are not unfrequent. 



