2 THE CYCLOPHORTD L.\ND MOLLUSKS OF AMERICA 



sible through the generosity of the late Jolm Brooks Henderson and 

 through the agency of the Walter Rathbone Bacon Traveling Scholar- 

 ship of the Smithsonian Institution. Especial thanks are due Prof. 

 Raul P. Guitart for his helpfulness with specific material needed by 

 us in the region covered by his explorations, but to mention all the 

 others who contributed material to our understanding of the fauna of 

 the Island of Cuba would prolong endlessly these acknowledgments. 

 We have mentioned under the various species the collectors to whom 

 we are especially indebted for such contributions. 



Our knowledge of the radulas, jaws, and verges discussed in this 

 paper is based on dissections made by Dr. Morrison. 



