Plate 82. 



Fig. 1. S piroloculina ienuiscptaia. X 27. D5238. a, face view; b, apcrtural view. 

 2. S piroloculina tenuiseptata. X 21. D5236. Starting to uncoil. 

 S. S piroloculina tenuiseptata. X 21. D523G. Later stage. 

 4. Spiroloculina convcxiuscula. X 21. a, face view; h, apertural view. 

 5-7. Spiroloculina costifera, var. plena, new variety. X 18. D523(). Various 

 stages in the development. 



571 



