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



Plate 40. 



FIG. 1. BILOCULINA DEPRESSA D'ORBIGNY. See Page 294. 

 a. Transverse Section. 



Fig. 2. BILOCULINA DEPRESSA, var. SERRATA Brady. See Page 294. 



a. Transverse Section. 

 FIG. 3. BILOCULINA DEHISCENS NEW SPECIES. See Page 295. 



