EXPLANATIONS OF PLATE XVII, 
DENDROGRAPTUS FLEXUOSUS, page 127. 
Fig. 1. A small frond of the natural size. 
2. A part of a larger frond. 
DENDROGRAPTUS DIVERGENS, page 129. 
Figs. 3, 4. A specimen of natural size, and an enlargement of the same. 
DENDROGRAPTUS STRIATUS, page 129. 
Fig. 5. A fragment of a frond, preserving the bases of some of the branches. 
“ 6. A portion of the non-celluliferous surface enlarged. 
DENDROGRAPTUS ERECTUS, page 130. 
Fig. 7. The principal stipe, and bases of some of the branches, of the natural size. 
DENDROGRAPTUS FRUTICOSUS, page 131. 
Fig. 8. A frond which is apparently nearly entire. 
«“ 9. A more diffuse form of the same species, with some of the branches broken off. 
