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



Plate 39. 



Fig. 1. BILOCULINA TUBULOSA Costa. See Page 293. 

 Fig. 2. BILOCULINA RINGENS Lamarck. See page 294. 



a. Transverse Section. 



Fig. 3. BILOCULINA COMATA Brady. See Page 294. 



Fig. 4. BILOCULINA ELONGATA Ehrenberg. See Page 294. 



