Yol. 50.] J1R. F. CHAPMAN ON THE BARGATE BEDS OF SURREY. 725 



The large number of forms new to the ISeocomian fauna, as 

 known elsewhere, is undoubtedly due to the circumstance that the 

 deposits of the Bargate series belong almost exclusively to the 

 Laminarian and Coralline zones. 



Taking into consideration the facts that 23 per cent, of the forms 

 here recorded are almost peculiarly Neocomian types, that these 

 added to known Cretaceous and Tertiary species amount to 122 or 

 87 per cent, (tho latter additions probably being due to the fact that 

 the Neocomian strata have not been so extensively examined in regard 

 to their Rhizopodal fauna as might have been desired), it is extremely 

 probable that the microzoic fauna of the Bargate series is almost 

 entirely, though (since we have the presence of a few Jurassic species) 

 not quite indigenous to the deposit. 



In conclusion, I tender my sincerest thanks to Prof. T. Rupert 

 Jones, F.R.S., and Prof. J. W. Judd, F.R.S., for much invaluable 

 aid and advice ; to Dr. G. J. Uinde, for his kindness in furnishing 

 the notes upon the sponge-spicules ; to Dr. W. Fraser Hume, 

 F.G.S., for the valuable notes on the denser minerals of the 

 sands f the Bargate series ; to Graf zu Solms-Laubach of Stras- 

 burg, a d G. Murray, Esq., of the Botanical Department of the 

 British Museum of Natural History, for examining the alga-like 

 bodies of the Bargate limestone ; and to Dr. J. W. Gregory for his 

 kind assistance regarding some of the doubtful polyzoan remains. 



Distribution of the Ostracoda in the Bargate Beds 

 of Surrey. 







c 

 o 



13 



O 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 



Cythere vesiculosa, sp. nov 



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 * 

 * 

 * 

 * 



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* 



Oythereis ornatissima (Reuss) 



„ „ var. reticulata, J. $ H. 



ytheridea retorrida, J. S{ 8 





„ rotundata, C. <§" S. 



,, bicarinata, J. # S. 









„ bipapillata, sp. nov 



Cytheropteron cnncentricura (Reuss) 



„ „ var. virginea, Jones ... 





„ reticulosum, sp. nov 



„ costuliferum, sp. nov 





3d2 



