192 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 24, 



Midland districts from that of the southern and northern areas in 

 England, in which that formation is developed, — the southern exhi- 

 biting the entire series of deposits, which seem to reappear in the 

 northern area, while in the Midland district the lower members have 

 not been observed. 



Mr. JuDD remarked that the conditions of deposition in the North 

 and South had been different ; the Red Chalk increases northwards, 

 from 4 feet at Hunstanton to 30 feet at Speeton. He considered 

 that the Carstone does not represent the Tealby series of Lincoln- 

 shire, and that it is probably Aptian or Upper N'eocomian, but con- 

 taining in its lowest part fossils derived from the disintegration of 

 Lower Necomian beds, in the same manner as the deposits of phos- 

 phatic nodules at Potton and Upware. 



Mr. Whitaker objected to the use of chemical characters in the 

 identification of beds, and thought that the presence of the same 

 fossils did not necessarily prove the identity of the Eed Chalk and 

 the Gault. 



Mr. Wiltshire, in reply, maintained the sufficiency of the Palae- 

 ontological evidence, that furnished by the species of Ammonites 

 being especially remarkable. 



Pebrtjart 24, 1869. 



Henry Cook, Esq., M.D., H.M. Bombay Medical Service ; Lieut. 

 William Innes, E.E. ; H. E. Moiser, Esq., Heworth Grange, York ; 

 E. Hill Tiddeman, Esq., B.A., Oriel College, Oxford, and Samuel 

 Allport, Esq., Snow HiU, Birmingham, were elected Eellows. 



The following communication was read : — 



On the Distribution of the British Postglacial Mammals. 

 By W. Boyd Dawkins, Esq., M.A., E.E.S., E.G.S. 



§ 1. Introduction. 



§ 2. Distribution through England 



and Wales. 

 § 3. Authorities. 

 § 4. Notes on Species. 

 I 5. Identity of Mammalia of Caves 



with those of River-beds. 

 § 6. Predominant Animals. 

 § 7. Postglacial Mammals of Scotland 



and Ireland. 



8. Cause of unequal distribution. 



9. Relation of Postglacial to Pre- 



glacial Mammals. 



10. Relation of Postglacial to Pre- 



historic Mammals. 



1 1 . Characteristic Postglacial Mam- 



mals. 



12. Age of the Lower Brick-earths 



and the Deposit at Clacton. 



13. Postglacial Climate. 



§ 1. Introduction. — The materials on which this essay is founded 

 are the result of ten years' work on the Pleistocene Mammalia of 

 Great Britain, during which every public Museum and private col- 

 lection of note in the United Kingdom has been examined, either 

 by myself or by some one on whose judgment I could depend. To 



