X75 



109 (108) Sutures look beaded; umbilicus is occupied by a large and slightly raised plug. Diameter 0.45-0.60 nun. 

 Variant forms illustrated: a, b, side and edge views of specimen with prominent umbilical plug; c, d, side and 

 edge views of specimen with depressed and granular umbilical area Elphidium galvestonense 



109 {108) Sutures look pitted; umbilicus is flush or slightly depressed 1 10 



1 10 (109) Sutures and septal bridges are distinct Ill 



1 10 (109) Septal bridges are inconspicuous 112 



1 1 1 (110) Sutures are flush; septal bridges are short and clearly visible. Diameter 0.22-0.32 



mm. a, Side view; b, edge view Elphidium incertum 



111 (110) Sutures and umbilicus are slightly excavated; septal 

 bridges are short compared with width of chambers. 

 Diameter 0.50-0.60 mm. a, Side view; b, edge view 

 Elphidium excavatum 



112 (11(J) Sutures are simple, moderately depressed. Diameter 



0.45-0.75 mm. a. Side view; b, edge view Elphidium bartletti 



X75 



X80 



36 



