PLATE XXXVL 



FaVOSITES ARBUSCULA. 11. sp. 



Fig. 1. A fragment of a branching form, with irregular cells. 



Fig. 2. An irregular form which has its origin near the center and extending in both directions in 



a subcylindrical form. 

 Fig. 3. An obliquely lateral view of a small colony, growing in a cespitose form. 

 Fig. 4. A form similar to the preceding, but of more extended growth. 

 Fio-. 5. A large arborescent form. Tlie ba.se has been broken off, so that tlie full e.xtent is not 



known. 

 Fi''. 6. An enlargement from another colony, showing the form and external aspect of the cells. 

 Fig. 7. A longitudinal section of a branch, showing the cells, with interrupted diaphragms. 

 Fig. 8. An enlargement from a longitudinal section of a branch, showing the cells and diaphragms. 

 Fig. 9. A transverse section of a branch, showing the cells at their origin in the center. Hamilton 



group, at Moscow and York, in Livingston county, and other places in Western New 



York. 



