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be seen that none of 

 these are confined to 

 any one zone, most of 

 them being common at 

 one locality in what he 

 regards as zone D, at 

 another in E, and in F 

 or G at a third or 

 fourth. On the con- 

 trary, it is sometimes 

 the case that forms are 

 common at one spot 

 and rare at another in 

 beds considered by Mr. 

 Burrows to belong to 

 the same zone. Even 

 if this were not so, I 

 cannot think that the 

 evidence of the forami- 

 nifera is of great value. 

 Most of the forms in 

 question are still living, 

 and they have a world- 

 wide distribution, being 

 found in all seas and at 

 all depths. Of one, Mi- 

 liolina seminulum, the 

 authors of the Palseont. 

 Soc. monograph say, 

 ' Scarcely a sample of 

 sea-sand, either dredged 

 or littoral, from any 

 quarter of the globe, 

 can be examined with- 

 out finding specimens 

 of it.' ^ Moreover, the 

 foraminifera are not 

 generally so distinctive 

 of special formations 

 as are the moUusca, 

 having a wide range 

 in time as well as in 

 space ; the Crag species, 

 with one or two excep- 

 tions, are recent forms, 

 going back also to 

 early Tertiary, and 

 some of them even to 

 the Mesozoic or Palaeo- 

 zoic epochs. 



1 02). at. p. 10 (1866). 



