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



Plate 64. 



FIG. 1. CRISTELLARIA GIB3A D'ORBIGNY. See Page 317. 



Fig. 2. CRISTELLARIA ARTICULATA Reuss. See Paqe 317. 



Fig. 3. CRISTELLARIA ORBICULARIS d'Orbigny. See page 317. 



Fig. 4. CRISTELLARIA ROTULATA Lamarck, see page 317. 



a. Horizontal Section 



