PLATE XXII. 



FISTULIPORIDRA. 



(Page 606.) 



FlSTULIPORIDBA TE8SELATA, Hall. 



Fig. 1. An enlargement, showing the circular cell apertures and the 



polygonal vestibular areas. xl8. 

 Fig. 2. An enlargement of a transverse section, showing the internal 



structure, the same as in Fistuliporina. 

 Fig. 3. An enlargement of a vertical section, showing the cell tubes 



and the intercellular structure. x6. 

 Hamilton group. Western JVew York. 



. FISTULICELLA. 



(Page 606.) 



FiSTULICELLA PLANA, Hall. 



Fig. 4. An enlargement of the surface. xl2. 



FISTULIPORELLA. 



(Page 560.) 



FiSTULIPORELLA CON STRICT A, Hall.' 



Fig. 6. An enlargement of the surface showing the denticulated 

 cell apertures, the interapertural pores and the vestibular 

 polygonal areas. xl8. 



Fig. 6. An enlargement of a tranverse section. xl8. 



Fig. 7. An enlargement of a vertical section, showing the cell tubes 

 and the intercellular structure. x6. 

 Hamilton group. Western JVew York. 



LICHENALIA. 

 (Page 559.) 

 The following figures are given to show the character of the cell 

 apertures : 



Figs. 8, 9. Lichenalia colliculata. 

 Fig. 10. Lichenalia iateraspera. 



Hamilton group. JVew YorJc. 



662 



