Fig. 7. 
EXPLANATIONS OF PLATE XI. 
GRAPTOLITHUS RIGIDUS, page 105. 
. A fragment preserving the centre and principal branches. 
. A larger specimen, showing the principal ramifications of the branches. This 
and the preceding specimen show only what appears to be the non-cellu- 
liferous portion of the frond. 
. The extreme parts of some branchlets laterally compressed, showing the cellu- 
liferous parts of the frond. 
. An enlargement of one of the branchlets of fig. 3. 
. A strong branch with part of the branchlets, showing the lower side or non- 
celluliferous portion of the frond. 
GRAPTOLITHUS ABNORMIS, page 106. 
. A fragment of slate preserving the centre and the branches on one side to 
beyond the first bifurcation. The other side is imperfect, and apparently 
less developed. 
GraprTouitaus Loeant, page 100. 
The central part of an individual without disc, showing five stipes on one side 
and four on the other. This is supposed to be an abnormal form of G, 
Logani. 
