PLATE VIII. 

 i 



Fig. 1. FAVOSITES TURBINATA, Billings. A cylindrical variety. Nat. size. (p. 49.) 

 Fig. 2. FAVOSITES TURBINATA, Billings. A turbinate variety. Nat. size. 

 Fig. 3. FAVOSITES HEMISPHERICA, Yandell & Shumard. Nat. Size. (p. 49.) 



Fig. 4. FAVOSITES FORBESI, Edw. & H. A fragment, in which many of the calicea are 

 closed by an epitheca. Nat. size. 



