PREFACE BY THE REVISER 



It has been a privilege to revise Louise M. Perry's fine book on 

 "Marine Shells of Southwest Florida", to include her studies on 

 eggs and larvae of mollusks; and to add descriptions and illustra- 

 tions of several newly discovered shells thus making it a more com- 

 prehensive study of the molluscan life of western Florida. The work 

 that I have done is only a small return to Dr. Perry for the many 

 hours of instruction that she has given to me for so fascinating an 

 avocation. Part of the material, other than that of Dr. Perry's, upon 

 which the descriptions in this book are based, is in my collection. 



Sincere thanks are given to Harald A. Rehder, Joseph P. E. 

 Morrison, R. Tucker Abbott, and Ruth Turner for help and advice; 

 and especially to Henry A. Pilsbry and William J. Clench, who so 

 generously gave of their valuable time to read the manuscript, which 

 therefore, has been so materially improved by their suggestions and 

 corrections. 



Acknowledgment is made of the valuable information gleaned 

 from the pages of the "Manual of Conchology," "The Nautilus," 

 "Johnsonia," and "American Sea Shells". Venia T. Phillips and 

 Maurice E. Phillips of the Academy of Natural Sciences kindly veri- 

 fied obscure references. 



My thanks are extended to Margaret Storey for permission to 

 photograph her beautiful drawings of the eggs, egg capsules, and 

 larvae; to Katherine V. W. Palmer for the use of photographs of 

 egg capsules and for her help and advice in this revision; also to 

 Marie Lebour, for the descriptions of eggs and larvae, which I have 

 quoted. 



I am grateful to Axel Olsson and Frank White, who photo- 

 graphed the shells and made the illustrations which have been added 

 to this study, and to my husband, Frank R, Schwengel, for his help- 

 fulness and encouragement. 



Scarsdale, New York 



March 5, 1954 Jeanne S. Schwengel 



