18 



PBOCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 73 



There is another way by which, to a limited extent, it is probable 

 that the Liguus may pass from one hammock to another and become 

 established. Mr. Charles Mosier informs me that he has on several 

 occasions seen crows flying with these snails in their beaks. It is a 



^^ 



Fig. 1. — Diagram illustrating the distribution and migration of Liguds in 

 Florida. The open spaces are pine woods ; those inclosed in lines, ham- 

 mocks. Dotted lines show migration to and from hammocks. Some bits 0*" 

 forest are reached by several ; others are entirely missed 



well-known fact that these and other large birds frequently prey on 

 Liguus and other arboreal snails, and I have seen the ground in 

 hammocks strewed with their broken shells. It is not unlikely that 

 these birds may occasionally pick from a tree one of these snails and 



