SOME TEKTIAEY MOLLUSKS FROM SOUTHERN 

 FLORIDA* 



By W. C. Mansfield 



United States Geological Survey 



INTRODUCTION 



The interesting moUuscan fauna upon which this paper is based 

 was received from Herman Gunter, State geologist of Florida, who 

 kindly gave me permission to study it. The author expresses his 

 sincere thanks to Mr. Gunter for the opportunity to study this fauna 

 and to Mr. G. M. Ponton, assistant geologist of the Florida Geo- 

 logical Survey, for furnishing J. H. C. Marten's description of the 

 locality and section, and to officials of the United States National 

 Museum; to Dr. Henry A. Pilsbry, of the Academy of Natural 

 Sciences of Philadelphia; and to Mr. Carl Boyer, director of the 

 Wagner Free Institute of Science, Philadlephia, for the opportunity 

 to compare specimens with their collections. 



The photographs used for illustrations in this paper were made in 

 the laboratory of the United States Geological Survey by W. O. 

 Hazard, and the prints were retouched by Miss Frances Wieser, also 

 of the Geological Survey. 



The types of the new species and subspecies and specimens repre- 

 senting nearly all the other species are deposited in the United States 

 National Museum, and a named set of specimens representing topo- 

 types and other species has been deposited with the Florida Geo- 

 logical Survey. 



OCCXniRENCE 



The fossils herein described were obtained from a ditch along the 

 Tamiami Trail, 42 miles west of Miami, Fla. (east side of sec. 25, T. 

 54 S., R. 34 E.), half a mile to one mile west of the test well of the 

 Miami Oil & Natural Gas Co., and approximately on the line between 

 Monroe and Dade ^ Counties. The specimens were collected by J. H. 

 C. Martens (1928) and by Herman Gunter and G. M. Ponton (1929). 



1 Published with the permission of the Director of the United States Geological Survey, 



2 According to Floiida Geol. Surv. Bull. 6, p. 10, Station No. 25, 1931, In Dade County. 



No. 2887.— Proceedings U. S. National Museum, Vol. 79, Art. 21. 



66546—31 I 



