258 



THE FOEAMINIFEEA 



and Arcliceclisciis, are also abundant in certain lime- 

 stones, so much so, in fact, as to merit in the former 

 case the name EndofJi/jra Limestone (fig. 30). Fre- 

 quently the Foraminifera are associated with other 

 organisms, such as Ostracoda, Polyzoa, Corals, and 

 so forth, which form together an organically derived 

 limestone. Two other genera were recorded by 

 Brady from the Carboniferous System which are 



Fig. 30. — Endothyra Limestone; Carboniferous, 

 DovEDALE, Derbyshire, x 24. Origimd. 



of especial interest, since they are characteristic of 

 certain strata of much later date, namely, Aniplii- 

 stegina (from Bristol) and Nniinji/iJifes (from near 

 Namur, Belgium). 



In some parts of the world we meet with a series 

 of sedimentary rocks which are partly homotaxial 

 with the Carboniferous strata, and partly with the 

 European group of the Permian which is so exten- 



