SMITHSONIAN EXPLORATIONS, I929 



III 



Fig. 91.— a cactus fence on the island of Bonaire. In the protection of such 

 fences many land moUusks are to be found. 



^. 



Fig. g2.—Ccrioii iiva on the base of a tree on the island of Bonaire, showing 

 the abundance of these mollusks. 



