54 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



spheric forms. The sutures on the dorsal side in the early stages are 

 straight and radial while in the adults they often become slightly 

 oblique. The characteristic sigmoid sutures on the ventral side may 

 be somewhat obscured but are usually evident especially at the inner 

 end. 



Brady's figures of " Truncatulina tenera" are much more charac- 

 teristic of the species than those he assigns to " Pulvinulina umbonata." 

 It should be noted that Flint's specimens referred to " Truncatulina 

 tenera" belong to Anomalina, and those assigned by Heron- Allen and 

 Earland in 1916 to this species are not identical. 



Eponides umbonata — Material examined 



EPONIDES UMBONATA (Reuss), var. EHRENBERGII (Bailey) 



Plate 9, figures 3 a-c 



Rotalina ehrenbergii Bailey, Smithsonian Contrib., vol. 2, art. 3, 1851, p. 10, 

 pi., figs. 11-13. 



Variety differing from the typical in the larger size, the more rounded 

 periphery and the greater number of chambers. 



Eponides umbonata, var. ehrenbergii — Material examined 



