PLJTE X. 



Heterocrinus tenuis (page 50). 



Figure la. Heterocrinus tenuis^ from the Trenton limestone, near the City of 

 Montreal. 

 " \b. Part of column and base of another specimen on same slab. 

 " \c. Enlargement of 16. 



" Ir/, le. Other fragments on the same slab of stone. 

 [ See also Plate IV.] 



Carabocrinus tuberculatus (page 33). 



Figure 2a. The only specimen collected. 



" lb. Three joints of the column, enlarged. 

 " 2c. One of the joints of the arms, enlarged. 



Syringocrinus paradoxicus (page 65), 



Figure 14. A specimen collected at Beauport. 



COLUMNS OF undetermined GENUS. 



Figure 3. A quinquepartite column from the Trenton limestone, City of Ottawa. 



" 4-?. Fragments from Hudson River group, Point William, Lake Huron. 



•' 8. From Trenton limestone, Jlontreal. 



" 9. The same, enlarged. 



" 10. From the Hudson River group, Anticosti. 



" 11. The same, enlarged. 



" 12. A small striated column from the Trenton limestone, City of Montreal. 



" 13. The same, enlarged. 



