DESCRIPTIONS OF NEW SPECIES OF FORAMINIFERA OF 

 THE GENUS DISCOCYCLINA FROM THE EOCENE OF 

 MEXICO 



By Thomas Wayland Vaughan 



Of the Scripps Institution of Oceanography, La Jolla, Calif. 



INTRODUCTION 



This paper contains descriptions of those identifiable species of 

 Discocyclina {Discocyclina) Glimbel that are available to me from 

 Mexico. No record is made of a few specimens of whose specific 

 identification I am not sure. The subgenus Asferocyclina Glimbel 

 is also represented in the Mexican Tertiary formations, but it is 

 not considered here. All the material described was received through 

 the geologists of the Aguila Oil Co., except some specimens of Dis- 

 cocyclina perpusilla, which were sent me by W. S. Cole, of Cornell 

 University, and the specimens of D. stepJiensoni, which were collected 

 by Dr. L. W. Stephenson. The geologists with the Aguila Company 

 from whom material was received were Messrs. Paul Weaver, 

 D. R. Semmes, and W. S. Adkins and myself. Some of the material 

 was submitted to me while I was resident in Washington and worked 

 in the United States National Museum and some of it was sent to 

 me after I transferred my home to California. An endeavor has been 

 made to place all types in the National Museum, and this has been 

 done except a few thin sections of specimens sent me after I came to 

 California. Every species and the one variety are represented by 

 type-material in the National Museum collections and topotypes are 

 at the Scripps Institution of Oceanography. 



STRATIGRAPHIC DISTRIBUTION AND SIGNIFICANCE OF SPECIES 



The stratigraphic distribution of the species appears to be as 

 follows : 



Lower Eocene, Chicontepec formation. 

 D. weaveri, new species. 



var. parvipapillata, new variety. 

 D. cristensis (Vaughan) Vaughan. 

 D. stephensoni, new species. 

 Uppermost lower Eocene or lowest middle Eocene. 



D. 2aragosensis, new species. 

 Middle Eocene. 



D. cushmani, new species. ^ 



No. 2800.— Proceedings U. S. National Museum, Vol. 76, Art. 3 



44031—29 1 1 



