PLEISTOCENE GEOLOGY OF THF. THAMES VALLF.Y. 359 



OSTRACODA. 



The first account of the Ostracoda occurring in the 

 Pleistocene deposits of Grays was given by Prof. T. Rupert 

 Jones in 1850. (8a) They were subsequently described in the 

 Memoirs of the Palaeontographical Society and the following 

 species are recorded. 



Cypris browniana, var. tumidus, Jones. 

 Illocypris gibba, Rahmdohr. 

 Cyprideis torosa, Jones. 

 Potamocypris trigonalis, var. Isevis, Jones. 

 Herpetocypris reptans, Baird. 

 Candona Candida, Mull. 

 For descriptions and notes of these specimens we must refer 

 the reader to the memoirs above cited. 



PLANTS. 



For our knowledge of the Pleistocene Flora of Grays we 

 are indebted to the labours of Mr. Clement Reid, F.R.S. His 

 determinations are based upon specimens in the collection of the 

 late Sir Joseph Prestwich, which specimens had previously been 

 partly identified by Prof. Oswald Heer. The species listed by 

 Mr. Reid in his paper are (67a) 



Ranunculus repens, Linne. 



Rubus fruticosus, Linne. 



Rosa canina, Linne. 



Hedera helix, Linne. 



Ulmus ? 



Alnus glutinosa, Gart. 



Quercus robur, Linne, var. sessiliflora. 



Corylus avellana ? Linne. 



Populus c/canescens. 



Salix, sp. 



Potamogeton. 



Cyperus ? 



Phragmites ? 



Grass nodes. 



Equisetum. 



Mr. Reid says of these species, " The plants occur asso- 

 ciated with, or below the remains of Mammoth and Corhicnla 

 fluminalis. They point distinctly to a temperate climate and 



