PLATE Xni. 



Favosites ? Argus n. sp. 



Fig. 1. Lateral view of a small subolavate specimen, showing the larger cells somewhat crowded 

 in places. 



Fig. 2. A lateral view of a broader pyriform specimen, having the larger cells less numerous. 



Fig. 3. View of an irregularly growing pyriform specimen, where the larger cells are numerous 

 and strongly exsert. 



Fig. 4. The upper side of a large depressed hemispheric form, where the larger cells are distant 

 and conspicuous. 



Fig. 5. A vertical .section of a specimen where the cells remain open, but finely coated on the 

 interior, and showing the closely arranged, often crowded diaphragms. 



Fig. G. A vertical section of another individual mass, showing the mode of increase of the cells 

 and the striation of the surface, which produces the crenulations of the partition walls 

 at the aperture, as seen on figures 8, 9 and 10. In this specimen the diaphragms are 

 more distant ;han in fig. 5. 



Fig. 7. .\n enlargement of a fragment from the same mass as fig. o, showing the pores of the 

 cell-walls — a feature rarely observed. In this case tlie pores were revealed by par- 

 tially calcining the specimen, so as to bleach the substance of the cell- wall. 



Fig. 8. An enlargement of the surface from a beautifully weathered specimen. In the figure the 

 walls appear flattened on the surface instead of sharply carinate as in the example. 



Fig. 9. An enlargement of a transverse section near the surface of a specimen, showing the thick- 

 ness of the walls and their crenulated sides. 



Fig. 10. An enlargement of the surface looking obliquely across it. The larger cell-mouths, as 

 represented, are too much elevated and their sides too spreading. 



Favosites? sp. 



Fig. 11. A lateral view of an irregularly growing specimen, showing the general form and size of 

 the cells. The crenulations which are quite strong, are not apparent in the figure, 

 which is too small to show them properly. No pores have been observed in the cell 

 walls, and the specimen has been referred with doubt to the genus Beaumontia. 



