PLiTE II B. 



Faa'osttes hemispheric^ v:ir. tukbinata. 



Favosites turbiiiata Billings. Caiiad. Jourii., New Series, IV, p. 109, 1859; V, p. 258, fig. 7, 1880. 



Fig.s. 1, 2. View of the lower side and lateral view of a turbinate .specimen with a slender base, 



From the Upper Helderberg Limestone in Western New York, near Batavia. 

 Fig. 3. Lateral view of a more erect form, from Clarence Hollow, New York. 

 Fig. 4. Lateral view of a specimen which maintains its turbinate form to about half its height, 



and becomes dome-shaped above. The surface faintly shows the structure. From 



the Upper Helderberg Limestone, Sandusky, Ohio. 

 Fig. 0. Postero-Iateral view of the same individual. 

 Fig. G. Section of a similar specimen showing, on the fractured surface, the faces of the tubes with 



the mural pores. 

 Fig. 7. A longitudinal section of a specimen showine the mode of growth of the cells, the trans- 



ver.se diaphragms and some of the mural pores. 



Favositks hemispherica viir. 



d/nlliopJijiUnm iiuadngeminum (Goldf.) Eaton. Geological Text book, p. 38, plate 5, fig. GG. 183IJ. 



Kig. 8. The base of a very robust specimen from the Upper Helderberg Limestone, Western New 

 York. (See also plate 5). 



