PLATE 22. 
1. 100. 4. Paljeophycus simplex. 
1 a. A portion of a large stem, and section. 
I b. A fragment compressed and bent. 1 c. Section of the same. 
1 d. A small fragment, showing the groove along the side of the stem. 
2. 98. 3. Buthotrephis sijcculens. 
(Pag. 63.) 
(Pag. 62.) 
2 a. A portion of a large specimen, the branches scarcely compressed. 
2 b. A single stem with branches, from another plant. 
