THE CYCLOPHORID OPERCULATE LAND 

 MOLLUSKS OF AMERICA 



By Carlos de la Torre, Paul Bartsch, and Joseph P, E. Morrison 



INTRODUCTION AND ACKNOWLEDGMENTS 



This contribution is divided into three parts : Part 1, by Drs. Carlos 

 de la Torre and Paul Bartsch, deals with the forms inhabiting the 

 island of Cuba. Part 2, by Dr. Bartsch, describes the members of 

 the family known from the West Indies exclusive of Cuba. In Part 3, 

 Drs. Bartsch and Joseph P. E. Morrison discuss the mainland fauna. 

 While Part 3 is by far the largest portion of the paper, it probably 

 represents only a small fraction of the cyclophorid fauna inhabiting 

 this extensive territory, the exploration of which has scarcely been 

 started. 



We have not attempted to give complete bibliographic references to 

 all the species, since this would necessitate an enormous expansion of 

 the text, but all the citations involving problems of nomenclature have 

 been noted. 



The completeness of this monograph was made possible through 

 the splendid cooperation of the authorities of the Academy of Natural 

 Sciences of Philadelphia, particularly Dr. H. A. Pilsbry. We are 

 indebted also to Prof. H. Burrington Baker, of the University of 

 Pennsylvania, who unstintingly turned over for our examination all 

 the material needed in this group, especially from Jamaica. We are 

 glad, too, to acknowledge our obligation to Dr. d'Alte A. Welch for 

 his splendid collection of Jamaican cyclophorids, which he placed at 

 our disposal. The authorities of the Museum of Comparative Zoology 

 at Cambridge, Mass., through Dr. W. J. Clench, aided materially by 

 the loan of specimens for study. 



The cyclophorid material from Cuba came from several sources, 

 chief in importance being the extensive collection of Dr. de la Torre, 

 which furnished the major basis of our understanding of the genus 

 Farcimen. Next should be mentioned the large collections made sev- 

 eral years ago by Dr. Bartsch on several collecting expeditions that 

 enabled him to comb the island for mollusks. These were made pos- 



