PEOTOZOA — FOEAMINIFERA. 



25 



spore from one individual meets a spore from another it Gallery X. 

 fuses with it, and round the united pair grows a shell which 

 proves to be the central chamber of a small-sphered form. 



The two forms of shell are to be seen in the following Table-case 

 two pairs of so-called species ; in each case the name which 16- 

 has to be adopted for the whole species, and under which 

 it is exhibited, is the one printed in italics. 



Large Circle, 

 Small Sphere. 



Nummulites complana- 

 tus, Lamarck. 



N. perforatus (de 



Montfort). 

 N. gizehensis (Forskal). 



N. laevigatus, La- 

 marck. 



Assilina exponens 

 (Sowerby). 



Small Circle, 

 Large Sphere. 



N. Tchihatcheffi, d'Ar- 

 chiac. 



N. Lucasanus (De- 



f ranee). 

 N. curvispirus (Savi and 



Meneghini). 

 N. Lamarcki, d'Archiac 



and Haime. 



Assilina mammillata 

 (d'Archiac). 



Formation and 

 Country. 



Eocene and Miocene, 

 France, Bavaria, 

 Hungary, Egypt, 

 India. 



Eocene, India. 



Eocene, Egypt. 



Eocene, France, Eng- 

 land (Bracklesham). 



Eocene, 

 varia. 



India, Ba- 



A " Catalogue of the Fossil Foraminifera in the British 

 Museum," by T. E. Jones, was published by the Trustees in 

 1882. See further Carpenter, Parker, and Jones " Introduc- 

 tion to the study of the Foraminifera," London, Ray Society, 

 1862; Chapman "The Foraminifera," London, 1902; Lister, 

 Section on Foraminifera in Lankester's " Treatise on Zoology," 

 London, 1903, and Address to Section D., British Associa- 

 tion, 1906. 



EOZOON. 



This green serpentinous rock, in wavy layers, which was 

 formerly thought, chiefly by W. B. Carpenter and J. W. 

 Dawson, to have been built up by a colonial Foraminifer, 

 called by them Eozoon (the dawn animal), is found in some 

 of the very oldest rocks in Canada and Bohemia. A similar 

 mineral structure, however, also occurs in much later rocks, 

 including some of undoubted igneous origin. The organic 

 nature of Eozoon is therefore upheld no longer, but the 

 hypothesis had its uses in the impetus which it gave to the 

 microscopic and chemical study of rocks. 



Wall-case 

 9b, corner. 



