PLATE LXV—Continued. 
Reptaria stolonieera. 
- Page‘274. 
Fig - . 17. Fragments of fronds, natural size, incrusting Oi'Moceras constrictum, showing the form and mode 
of growth. 
Fig. IS. An enlargement from fig. 17, showing more distinctly the annulated cell tubes and their mode of 
growth. (X 6.) 
Fig. 19. Natural size of a somewhat broader frond than that represented in fig. 17. 
Hamilton group. Cazenopia, IV. Y. 
Heknodia humifusa. 
Page 281. 
Natural size of fronds incrusting GompTioceras abruptum, showing the form and mode of growth. 
An enlargement from the preceding, showing more distinctly the form of the cell apertures and 
their mode of growth. 
Hamilton group. Cazenopia, N. Y. 
Fig. 20. 
Fig. 21. 
