STUDIES OF AMERICAN SPECIES OF FORAMINIFERA 

 OF THE GENUS LEPIDOCYCLTNA 



By THOMAS WAYLAND VAUGHAN 

 Scripl's Institution of Oceanography, La Jolla, California 



(With 32 Plates) 



INTRODUCTION 



The principal purpose of this paper is to complete the description 

 of the species of the foramini feral genus Lcpidocyclma that have 

 come into my hands during a number of years and thereby to aid in 

 the solution of problems of geologic correlation in the Mexican Gulf 

 and Caribbean region. Incidentally, it is intended to assist in the 

 identification of some species by publishing additional figures and 

 descriptive notes and also to consider the problems of variation in a 

 few of the species. The accounts here given of the material available 

 to me from Mexico, Cuba, and the Island of Antigua are virtually 

 complete, except that descriptions and figures of a few well-known 

 or recently described species are not included. I still have in liand 

 from the Oligocene of Florida and Mississippi three or four species 

 that probably should be described, and some of the Panama species 

 need more study and comparison with material from other localities, 

 especially Trinidad and Venezuela. 



The Mexican material came to me from geologists connected with 

 the Aguila Oil Company of Mexico. The largest collection was made 

 by me personally while working for that company in November and 

 December 1920. Important supplemental collections were made by 

 Messrs. D. R. Semmes, W. S. Adkins, and Ruthven Pike. 



The collections from Cuba were obtained by Dr. A. C. Spencer, 

 while engaged in a geologic reconnaissance of Cul)a in 1901 ; by 

 Dr. O. E. Meinzer, while studying for the United States Navy the 

 ground-water problems in the vicinity of Guantanamo in 1915 ; and by 

 Dr. N. H. Darton, while making geologic investigations in the 

 vicinity of Guantanamo in 191 6. 



The Antiguan material was obtained first by myself during a recon- 

 naissance of the Island of Antigua in 1914, financed by a grant from 

 the Carnegie Institution of Washington, and after then through 

 the efiforts of Mr. W. R. Forrest, an amateur geologist resident in 

 St. John's. Mr. Forrest has collected foramini f era in Antigua for 



Smithsonian Miscellaneous Collections, Vol. 89, No. 10 



