PLATE 8. 



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



1. A I'lagmeiit of rock, showing several stems of this Ibssil, \vith their iinasloinosiii!; Inanolies. 



1 a. A similar vertical section, where the stems have been divided, showing that tliej- were originally hollow. 



1 i. A bulb of stony matter, embraced by the stems or rootlets of this fossil. The stems apparently jirocecd 

 from such a bulb or root ; as the radicles converge below and diverge above, as represented in the (igure. 



1 c. A horizontal section, presenting the ends of several stems, most of whicli 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 d. A horizontal section of stems larger than the usual size : these stems are cellular, with ajiparent lon- 

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



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

 matter around tliem, which, on weatliering, presents the appearance here represented. 



