PLATE LXV. 

 Hedeuella Canadensis. 



Pago 277. 



1. A fpond, natural size, showing the form ami mode of growth. 



2. An enlargement, showing an unusually compact growth. (X 15.) 



3. A still further enlargement of a compact growth, showing more distinctly the form of the cell 

 apertui-es. (X 12.) 



An enlargement, showing distant cell tubes. (X 12.) 



An enlargement, showing the cell tubes parallel to, and in contact with the main axis. (X 3) 

 An enlargement, showing distant, sharply annulated cell tubes. (X 6.) 

 An enlargement, showing alternating cell tubes in contact with the main. axis. (X 3.) 

 An enlargement, showing the usual mode of growth. (X 3.) 



An enlargement, showing the transverse wiinkles and striations of the cell tubes and main axis. 

 (X3.) 



Hamilton group. York, Livinytlun comity, N. Y. 



Hederella filiformis. 



Page 278. 

 Fig. 9. A frond, natural size, showing the form and mode of growth. 

 Pig. 10. An enlargement, showing strongly annulated cell tubes. (X 6.) 

 Fig. 11. An enlargement, showing the form of the cell tubes and mode of growth. (X 2.) 

 Hamilton gi-oup. York, lAvluyaloii cinmty, N. Y. 



Hederella cirrhosa. 



Pago 277. 

 Fig. 12. A fi-ond, natural size. 



Fig. 13. An enlargement of fig. 12, showing moi-e distinctly the foi-m of the cell tubes and mode of growth. 

 (X6.) 



Hamilton group. West BUxnafield, N. Y. 



Hederella magna. 



Page 2X0. 

 Fig. 15. An enlargement, showing the form and mode of growth of the cell tubes, the annulations and fine 

 longitudinal striations. (X 6.) 



Hamilton gi-oup. Yirrk, Livingston county, N. Y. 



Hederella Canadensis. 



Page 2(7. 

 Fig. IC. An enlargement of a frond. (X 3.) 



Upper Helderberg group. FaXla of the Ohio river. 



