T1IK l'I.KI>TDCKNK SKK1KS 



639 



The Neolithic fauna i- vi-ry different iVoin tin- ;ibo\., ami 

 includes only one extinct species (Cervus yiyanteus), though there 

 an-, of com>c, many animals which have Milcqm-iilly become 

 extinct in Britain, such as the reindeer, brown bear, wolf, wild 

 boar, and beaver. 



Palaeolithic man was a hunter only; Neolithic man \\a~ a 

 herdsman and agriculturist, and he introduced several domesticated 

 animals, such as the dog, sheep, goat, pig, and short-horn co\v. 



Fig. 209. PLEISTOCENE LAND AND KRESHWATKK MIKI.I.S \\11K H AUK NOW 

 EXTINCT IN BRITAIN. 



(Reproduced by permission of Mr. B. B. Woodward and the Council of tin- 

 Geologists' Association.) 



1, 2. Unio littoralis. 

 3, 4. Corbicula Huininalis. 

 5. Pisiiliuiu astartoideg. 



6. risidiiini ainnicuin. 



7. Helix (Eulota) fruticuiu. 



8. Hydrobia marginata. 



The molluscau fauna of the older Pleistocene deposits, /.<. tin- 

 fauna of the freshwater deposits, is also interesting, for it includes 

 a few extinct species and a certain number which no longer live in 

 Britain, though most of them still exist in Europe or Asia. 

 Prominent among these is Corbicula fluminalis, a species which is 

 extinct in Europe but still lives in the rivers of North Africa ; 

 another is Vivipa.ro, diluviana y believed to be entirely extinct, as is 



