PLANT-EATING MOLLUSCS 201 



the Arion had yet more than a yard to traverse M. Parentean 

 picked up the bean and put it in his pocket. The Arion 

 stopped, raised its head, and turned in every direction, waving 

 its tentacles, but without advancing. M. Parenteau then carried 

 the bean to the other side of the road and put it in a small hole 

 behind a piece of stone. The Arion, after a moment's inde- 

 cision, started off straight for the bean. Again the position 

 of the precious morsel was changed, and again the Arion made 

 for it, this time without being further tantalized. M. Moquin- 

 Tandon noticed, one rainy day, in the botanical gardens at 

 Toulouse, two Limax maximus approaching a rotten apple 

 from different directions. He changed the position of the apple 

 several times, placing it at a sufficient distance to be sure that 

 they could not see it, but they always hit it off correctly, after 

 raising their heads and moving their long tentacles in every 

 direction. It then occurred to him to hold the apple in the air 

 some centimetres above the head of the Limax. They per- 

 ceived where it was, raised their heads and lengthened their 

 necks, endeavouring to find some solid body on which to climb 

 to their food." 



