PLATE VI. 



FaVOSITES EriDERjrATA. 



Ftivosilfa ipidennahi Rominger. American Journal of Science, Vol. XXXIV, p. 396. 1863. 



Fig.s. 1, 2. View of the opposite side.s of a flattened clavate specimen, which is, to a great extent, 

 destitute of epitheca, showing the form and size of the cell.s, and in many places, 

 the remains of the partial transverse diaphragms. 



Figs. 3, 4. Lateral and summit views of a .^mailer, somewhat similarly formed individual. This 

 and tlie preceding specimen are from the Upper Helderberg limestone, near Al;ron, 

 ' N. Y. 



Fig. 5. View of a somewhat oblique longitudinal weathered section, showing the size of the coral- 

 lites with remains of tlie transverse diaphragms. Upper Helderberg group, near Cale- 

 donia, N. Y. 



Favo.siteh tuberosa. 



{See Plate 8.) 



Fig. G. A part of tlie outer surface of a large clavate form, showing the junction of the epithecal 

 portion with the open cells. The epitheca is usually very thin, and leaves the pro- 

 jecting parts of the dead cells protruding, giving an exceedingly roughened surface. 

 Upper Helderberg group, Cayuga, Ontario. 



