194 



REPORTS. 



was not due to natural friction of pebbles on the beach. It 

 probably once stood on the land surface not far from its 

 present position, and in consequence of the erosion of the sea 

 it fell on the beach. At the present rate of erosion at this 

 part of the coast this must have happened some hundreds of 

 years ago. 



BOULDER WITH EXCAVATED BASIN, on beach at L'Eree. 



Note. — According to an article on " Les Laverasses en granite, du 

 Bocage Vendeen. Leur origine neolithique ; lenr usage primitif," by Dr. E. 

 Boismoreau, of La Vendee, in "Bulletin dela Societe Prehistorique Francaise," 

 Tome X. (1915), p. 713, similar troughs or basins excavated on granite 

 boulders are found in La Vendee. The basins are usually round or oval in 

 shape, the largest, that at La Guillerie, measuring 30 cm. by 18 cm. They 

 are excavated on the flat upper surface of the boulders and sometimes are 

 accompanied with cup -markings and ' ' polisoirs. ' ' The surface of the basins is 

 well polished and seems to have been worked out with a flint " burin." They 

 are considered to belong to the neolithic period. 



