IN THEIR ROLE AS WORLD-BUILDERS. 15 



27. La Harpe, P. de. Monographie der in Aegypten und der 



libyschen Wiiste vorkommenden Nummuliten. Palaeonto- 

 graphica, vol. xxx. 1883 (3 Folge, Bd. 36), p. 155. 



28. Carpenter, W. B., Parker, W. K., Jones, T. B. Intro- 



duction to the study of the Foraminifera. London (Ray 

 Soc), 1852, p. 262. 



29. Agassiz, A. Three Cruises of the Blake. London, 1888,. 



vol. i., p. 150. 



30. Jukes-Brown, A. J. Handbook of Physical Geology. 



London, 1884, p. 130. 



31. Haug, E. Traitede Geologic II. Les Periodes Geologiques. 



Fascicule 3. Paris, 1911. 



32. Jukes-Brown, A. J. The Cretaceous Bocks of Britain, with 



contributions by W. Hill. London, Geological Survey, 

 volii., 1903, vol. iii., 1904. 



Description of Plates 1 3. 



With the exception of PI. 1, fig. 1, PI. 3, fig. 4, the figures are 

 from original sources. 



Plate 1. 



Fig. 1. Spirillina Limestone. Upper Cambrian, Malvern (after 

 Chapman, Q.J.G.S., vol. lvi., 1900, Plate 15). 



,, 2. Saccammina Limestone. Carboniferous. Pathhead, Had- 

 dington, N.B. 



,, 3. Endothyra Limestone. Carboniferous. Indiana. 



4. Nubecularia Limestone. Permo- carboniferous. Polkolbin, 

 Maitland, N. S. Wales. 



Plate 2. 



Fig. 1. Middle Chalk. Zone of Rhynchonella Cuvieri. Hitchin. 

 ,, 2. Alveolina Limestone. Eocene. Mixon Bock, Selsey. 

 ,, 3. Alveolina Limestone. Eocene. Bunnu, N. W. Frontier 



India. 

 , 4. Kummulitic Limestone. Eocene. Gizehj Egypt. 



