440 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Juiie 1, 



of the former, the Lunulites urceolatus, has been recognised by Mr. 

 Rupert Jones in the Woolwich beds beneath the London Clay. 



Of the Crustacea, which form so remarkable a group in the Lon- 

 don Clay, comparatively little is at present known. Prof. M'Coy 

 has described 7 species, but the number of determinable species in the 

 collections of Mr. Wetherell and Mr. Bowerbank amounts to at least 

 20 or 30, all or most of which appear to be peculiar to the London 

 Clay ; but it must be observed that very few crustacean remains have 

 been found at Bracklesham, and these have not been satisfactorily 

 determined. It is doubtful whether there are species in common. 

 Mr. R. Jones has determined 9 species of Entomostraca from the Lon- 

 don Clay, and 6 from the Bracklesham Sands ; 2 species are common. 



Mr. Darwin mentions only one species of Cirripedia from these 

 Eocene strata, and that one is peculiar to the London Clay. 



The Annelids number 1 1 species, of which two only are in common. 



The Eocene Echinodermata have been thoroughly examined by 

 Prof. E. Forbes, and it seems that although 17 species occur in the 

 London Clay, it is doubtful whether any one species passes upwards. 

 The Bracklesham Sands, however, contain but one species. 



The Corals, as now very fully determined by Mr. Lonsdale and 

 M. Milne-Edwards, give an equally definite result : 26 species are 

 described, of which it seems that not one is common to the Loudon 

 Clay and the Bracklesham Sands, there being 10 species found in the 

 former, and 16 in the latter deposit. 



The Foraminifera yet require further examination : 23 species are 

 found in the London Clay, and 8 in the Bracklesham beds, and of 

 these it is doubtful whether any one is in common ; but the great 

 and marked feature is the total absence of Nummulites in the former, 

 and their presence in such abundance in the overlying deposits of the 

 Bracklesham Sands. 



With regard to the Plants, the London Clay is so exceptional 

 in the mineral conditions which have preserved its remarkable 

 and abundant flora, that no part of the Bracklesham series offers 

 a fit term of comparison, and we cannot therefore take into con- 

 sideration the many hundred species of fruit and seed remains 

 which are peculiar to the London Clay. Mr. Dixon, however, in his 

 list of the Bracklesham fossils, quotes the Lycopodites squamahis and 

 Cucumites variabilis, both of which" are Sheppey species, whilst his 

 Pinites Dixoni is peculiar to Bracklesham. These 3 species consti- 

 tute at present all the known Bracklesham flora. 



In these comparisons some allowance must necessarily be made for 

 differences of conditions and habitat, but the equality is sufficiently 

 maintained not to affect the general conclusions. 



The lists of the organic remains of the London Clay contained in 

 the last paper, and that of the Bracklesham Sands appended to this 

 paper, give the following results*. 



* As many of the new species of Molluscs, although undescribed, have been 

 specifically determined by Mr. Edwards, I have included them in the numbers 

 given in this table, and which are therefore so much in excess of the numbers given 

 in the preceding Usts. No additions are made to the other portions of the fauna. 



