PLATE XL 



Favosites tubeeosa. 



Fig. 1. An enlargement of a part of the longitudinal section * of fig. 4, plate 8, showing tne entire 

 and incomplete diaphragms and the large mural pores. 



Favosites hemispherica var. tukbinata. 



Fig. 2. An enlargement from the cells of the same specimen represented in section fig. 4, showing 

 the partial diaphragms, which give a radiated appearance to the cells. 



Fig. 3. A longitudinal section enlarged from the same specimen, showing the distant entire dia- 

 phragms. 



Fig. 4. A longitudinal section, natural size. Tlie specimen is of the same form as fig. 4, plate 23, 

 and is from the Upper Helderberg group at Sandusky, Ohio. 



Favosites Emmonsii. 



Fig. 5. An enlargement of a fragment, showing the complete and imperfect closely arranged dia- 

 ■■ phragms. 



Favosites hemispherica. 



(See also Plates 3 and 2 A.) 



Fig. 6. An enlargement of a longitudinal section of a specimen with open cells and distinct small 

 [lores, corresponding in form to those represented by figs. 4 and 5, Plate 2. 



Fig. 7. A longitudinal section corresponding with fig. 6, but not showing mural pores. 



Fig. 8. An enlargement from a weathered section of the specimen fig. 8, plate 2 B, showing the 

 transverse diaphragms and the sirgle row of mural pores. This specimen has all 

 the characteristics of tliose referred by Eaton to CijathnphyUum qiiadrigeminum ; the 

 weathered cells presenting the stellate character represented in his figure. 



Fig. 9. An enlargement of a vertical fi'actured surface, showing the form of the sides of the cells, 

 the disposition ot the mural pores and the transverse stripe. 



Fig. 10. An enlargement of a vertical section (of this species?) where the cells are open, showing 

 both entire and incomplete diaphragms. 



Favosites epidermata var. corticosa. 

 (See also Plate 10.) 

 Figs. 11 and 12. Transverse and longitudinal sections of a flattened branch of this species, showing 

 the size of the cells and the transverse diaphragms. 



* Figures are referred to as longitudinal sections when representing a out parallel to the longitudinal 

 direction of the cells, and a cutting from base to summit is referred to as a vertical section. 



