PLATE LX— Continncd. 



StICTOPOKA SUBBIGIDA. 

 Page 251. 

 Fig. 21. An enlai'^ement, showing the form and disposition of the cell apertui-es, and the longitudinal 

 ridges. (X 6.) ' f 



Hamilton groapi Tu>o and one-half miles east of Alden Station, N. Y. 



StICTOPORA CRENUI.AT.A. 



Page -252. 

 Fig. 22. An enlargement, showing the foi-m and disposition of the cell apertures, the .striations separating 

 them and the crenul.ited margins of the frond. (X 6.) ,|,,,,, 



Hamilton gi-oup. Two and mie-half miles east of Alden Slathm, N. Y. 



