PLATE LXII. 



StICTOPORA INCRA88ATA. 



Page 249. 

 Fig. 1. A fi-agment. natural size. 

 Fig-. 2 An enlargement, showing the longitudinal disposition of the obovate cell apertures, the equally 



elevateil i>eri8toines and the sinuous ridges dividing the ranges of ai)ertures. (X 6 ) 

 Fig. 3. A still further enlargement, showing moi-e distinctly the charactei-s represented in fig. 2. (X IS.) 

 Pig. 4. An enlargement, showing the cell apei-tures with nodulose opereula, their arrangement, and the 



flattened space between the rows of apertures. (X 6.) 

 Fig. 5. A still further enlargement, showing more distinctly the charactera repi-esented in fig. 4. (X IS.) 

 Fig. 6. An enlargement of the transvei'se section of a frond. (X t5.) 



Hamilton gi-oup. IVett yVUliainn, Ontario, Canada. 



Stictoi'ora intekstriata. 



Page 259. 

 Rg. 7. A fi-agment. natural size, showing the form and manner of gi"Owth. 

 Fig. 8. An enlargement, showing the form and disposition of the cell apertures, the equally elevated 



iwristomes, the spinuliform pi-ojections, and the sliiated, non-celluliferous marginal space. 



(X6.) 

 Fig. 9. A still further enlargement, showing more distinctly most of the features represented in fig. 8. 



(X IS.) 

 Fig. 10. A still further enlargement of one of the cell apertures, showing more distinctly the spiniform 



projections from the interior. (X 70.) 



Hamilton gronj). FcUl-hrmk, Ontarit) amnty, N. Y. 

 Fig. 11. An enlargement of the fi-ond at a bifurcation, showing numerous longitudinal striations obscuring 



the cell ajiertures. (X 6.) 

 Fig. 12. An enlargement; the greater portion showing the mesotheca, with markings caused by the 



i-ecumbcnt jmrtion 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, Brie county, N. Y. 



Pbismopora dilatata. 



Pafre265. 

 Pig. 18. 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. T%ree miles south-west of LeonardstAUe, Madison county, N. Y. 



