PLATE LXII. 
Stictopora incrassata. 
Page 249. 
Fig-. 1. A fragment, natural size. 
Fig. 2 An enlargement, showing the longitudinal disposition of the obovate cell apertures, the equally 
elevated peristomes and the sinuous ridges dividing the ranges of apertures. (X 6 ) 
Fig. 3. A still further enlargement, showing more distinctly the characters represented in fig. 2. (X 18.) 
Fig. 4. An enlargement, showing the cell apertures with nodulose opercula, their arrangement, and the 
flattened space between the rows of apertures. (X 6.) 
Fig. 5. A still further enlargement, showing more distinctly the characters represented in fig. 4. (X IS.) 
Fig. 6. An enlargement of the transverse section of a frond. (X 6.) 
Hamilton group. West Williams, Ontario, Canada. 
Stictopora interstriata. 
Page 259. 
A fragment, natural size, showing the form and manner of growth. 
An enlargement, showing the form and disposition of the cell apertures, the equally elevated 
peristomes, the spinuliform projections, and the striated, non-celluliferous marginal space. 
(X 6.) 
A still further enlargement, showing more distinctly most of the features represented in fig. 8. 
(X 18.) 
A still further enlargement of one of the cell apertures, showing more distinctly the spiniform 
projections from the interior. (X 70.) 
Hamilton group. Fall-brooTc, Ontario county, N. Y. 
An enlargement of the frond at a bifurcation, showing numerous longitudinal striations obscuring 
the cell apertures. (X 6.) 
An enlargement; the greater portion showing the mesotheca, with markings caused by the 
recumbent portion of the cell tubes ; the upper part shows the appearance of the cell aper¬ 
tures when the frond is macerated. (X 6.) 
Hamilton group. Near Alden, Erie county, N. Y. 
Prismopora dilatata. 
Page 265. 
Fig. 13. A fragment, natural size. 
Fig. 14. An enlargement of a portion of fig. 13, showing the form and arrangement of the cell aper¬ 
tures. (X 6.) 
Hamilton group. Three miles south-west of Leonardsville, Madison county, N. Y. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
