112 (110) Sutures are bordered by a wide opaque band of 

 micropapillae. Diameter 0.40-0.60 mm. a. Side view; b, 

 edge view Elphidium frigidum 



X100 



113 (99) Periphery is angled; aperture is comma-shaped; ahernating 

 chambers (as seen from either side) are nearly equal in size. 

 Diameter 0.25-0.35 mm. a. Side view; b, edge view 

 Cassidulina norcrossi 



1 13 (99) Periphery is rounded; alternating chambers (as seen from either side) are distinctly unequal in size 114 



X60 



114 (]J3) Test is large, thick. Diameter 0.32-0.45 mm. a, b, Opposite views; c, edge 



view Cassidulina algida 



114 (113) Test is small, compressed. Diameter 

 0.15-0.20 mm. a, b. Opposite views; 

 c, edge view Cassidulina islandica minuta 



X175 



1 15 (98) Coiled side is convex 



115 (98) Coiled side is flat; wall is coarsely porous 



.116 



.128 



37 



