270 



THE FOEAMINIFERA 



trocliidiformis. Just off Selsey a patch of partially 

 submerged rocks called the ' Mixens ' occurs, which 

 is a hard foraminiferal bed composed almost entirely 

 of Miliolina and AlveoUna, and which was used in 

 building the old Selsey churchyard wall. 



The ' Calcaire 'grossier ' beds of the Paris Basin 

 are of the same age as those just described, and 

 contain a similar foraminiferal fauna, with the addi- 



FiG. 31. — Miliolina Limestone (M. trigonula) ; Eocene, 

 Paris Basin. Original. 



tion of 0)-hif()Jitcs. The preponderance of Miliolina 

 (Pentellina saxorum and other species) in this rock, 

 which has been extensively utilised as a building- 

 stone for Paris, has given rise to its name ' Miliolitic 

 Limestone ' (fig. 31). 



The Upper Eocene of the Hampshire Basin con- 

 tains, in the Barton Beds, certain strata which yield 

 in abundance the small species of nummulites, N. 



