Plate 13 



Fig. 1. Pyrulina gutia d'Orbigny. X 45. Lowest Eocene, Wansin, Belgium. 

 a, b, side views; c, basal view. 

 2. Pyrulina vicksburgensis (Cushman). X 80. Lower Oligocene, Mint 

 Spring marl, at waterfall in Mint Spring Bayou, Vicksburg, Miss. 

 a, b, side views; c, basal view. 

 3-8. Pyrulina fusif or mis (Roemer). X 45. Upper Oligocene. 3-5, Ahnatal, 

 near Cassel, Germany. 3, 4, early stages. 5, adult. 6, young. Creta- 

 ceous, chalk marl, Saxon Cement Works, Cambridge, England. 7, 8, 

 Miocene. Tortonian, brickyard at Baden, near Vienna, Austria. 



158 



