332 Transactions of tht Society, 



the Eocene Clays exposed on the shore, but whether as derived 

 fossils or qoI it lias been impossible to determine. As, however, 

 with three exceptions all the specimens present the same super- 

 ficial appearance, we are still inclined to think that the original 

 home of the species is in some early Tertiary deposit which has 

 been denuded to such an extent that it now exists only below the 

 gea level. This theory would account for the presence of the 

 isolated specimens which we have obtained from later Tertiary 

 beds still in situ on the shore, and also for the; very large number 

 of specimens continually washed up upon the sands. 



The exceptional specimens to which we have referred above are 

 of a very much whiter appearance and calcareous texture. Apart 

 t'n mi their surroundings they might easily be mistaken for Cretaceous 

 fossils. This is. however, no doubt due to some accidental condi- 

 tions of preservation or weathering. We do not suppose that 

 Cycloloculina ranges back to the Cretaceous period. In spite of 

 the considerable amount of work which is now being done on the 

 Continent with the fossil Foraminifera, especially those of the Ter- 

 tiary period, no further records of the genus have been published. 



We may take this opportunity of acknowledging a suggestion 

 which we have received from Mr. J. J. Lister, F.K.S., to the effect 

 that C. polygyra may probably be the microspheric form of the 

 genus, C. annulata being the megalospheric form. There seems 

 every reason to believe that this may be the case, as the relative 

 proportions to one another of the specimens appear to carry out 

 this theory. In the absence of definite micrometric observations, 

 we are not at present prepared to go into this, but the great profu- 

 sion of the shells found in our sands supplies us with material of 

 which we hope shortly to avail ourselves, with a view to going into 

 this matter, to some extent at any rate, on the lines on which Lister, 

 Carpenter and others have dealt with the Nummulites. 



Lin derina Sch lum berger. 



375. Linderina brugesii (Schlumberger). 



(Plate XII. figs. 1-7.) 



Linderina brugesii Schlumberger, 1893, Bull. Soc. Geol. France, s. iii. vol. 21, 

 p. 118, and figs. 3-5. 



Among the fossil specimens commonly found in the shore-sands 

 of Selsey Bill were many of a shell which very early attracted our 



EXPLANATION OF PLATE XIII. 



Piilvinulina vermiculata d'Orbiguy sp. 



Fig. 1. — Superior surface. 

 „ 2. — Inferior surface of same specimen. 

 ,, 3. — Superior view of a small specimen. 

 „ 4. — Inferior view of same specimen. 



(All figures on this plate are magnified 50 diameters only.) 



