Report of U. 5. National Museum, 1897.— Flint. 



Plate 42. 



Fig. 1. 

 Fig. 2. 



Fig. 

 Fig. 



SPIROLOCULINA ROBUSTA Brady. See page 296. 



a. Horizontal Section. //. Transverse Section. 



SPIROLOCULINA ROBUSTA Brady, (transition stages from biloculina compress/> 



See Page 296. 

 SPIROLOCULINA LIMBATA D'ORBIGNY. See Page 296. 



SPIROLOCULINA PLANULATA Lamarck. See Page 297. 



