PLATE 8. 



Fig. 1. 64. 1. Phytopsis tubulosum. ( Pag. 38.) 



1. A fragment of rock, showing several steins of this fossil, with their anastomosing branches. 



i a. A similar vertical section, where the stems have been divided, showing that they were originally hollow. 



1 6. A bulb of stony matter, embraced by the steins or rootlets of this fossil. The stems api)arently jiroceed 

 from sucli a bulb or root ; as the radicles converge below and diverge above, as represented in the figure. 



I e. A horizontal section, presenting the ends of several stems, most of which are less than the ordinary size. 

 The rock is discolored for some distance around these stems, as if deprived of its coloring matter by the 

 carbonaceous character of the fossil. 



\ i. A horizontal section of stems larger than the usual size : these stems are cellular, with apparent lon- 

 gitudinal dissepiments in two of the four presented in the figure. 



I e. A horizontal or transverse section of the stems, showing a concretionary arrangement of the calcareous 

 matter around them, which, on weathering, presents the appearance here represented. 



