246 



Shell Life 



is the largest and the least sharply defined, but plain 

 specimens are far more plentiful. The animal is very 

 active, but also shy, for it rapidly withdraws into its 

 shell on very slight alarm. The old English form of 

 the name was Gowry. On some parts of the coast 

 it is the Nun, in others the Stick-farthing. 



Atlanta peroni (magnified) 



Between the Cowries and the Naked Tongues 

 (Gynmoglossa) there comes a group of sea-snails who 

 have become specially modified for a free-swimming 

 life in the open ocean. The foot 



instead of being 



