Number 152 August 12, 1024 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



LAND AND FRESHWATER MOLLUSCS OF THE 

 DUTCH LEEWARD ISLANDS 



By H. Burrington Baker 



Introduction 



In 1920, while on the University of Michigan-Williamson 

 Expedition to Venezuela, a small collection of land shells was 

 obtained from the Schaarlo, back of Willemstad, Curasao. ^ 

 In 1922, the University of Michigan Museum of Zoology sent 

 me back to the Dutch Leeward Islands to collect molluscs, 

 reptiles, amphibians and ants. With the assistance of an addi- 

 tional grant from the Zoological Laboratory of the University 

 of Pennsylvania, for the collection of grasshopper testes as 

 cytological material, I was able to spend the summer, from 

 June 11th to September 17th, 1922, in a study of all five of 

 the islands of the group. The reptiles collected have been 

 listed already, in a paper by Dr. A. G. Ruthven.^ 



From June 11th to 28th, Overzijde (Otrabanda), Curasao, 

 was the base for collecting trips. From June 29th to July 



1 1923; Occ. Papers, Mus. Zool. Univ. Mich., no. 137; pp. 1-7, pi. I. 

 2 1923 ; Occ. Papers, Mus. Zool. Univ. Mich., no. 143. 



