EXPLANATIONS OF PLATE IY. 
GRAPTOLITHUS BRYONOIDES, page 84. 
Figs. 1, 2, 3. Young individuals of this species. 
4, An older individual. 
“© 5, A young specimen preserving two of the stipes, the funicle having been broken. 
6. An enlargement from fig. 1, showing the radicle, funicle, and origin of the 
four stipes, with a few of the earlier cellules. 
. An older and larger specimen. 
. An enlargement from fig. 7 showing the character and proportions of the 
cellules. 
9, A small individual, preserving the four stipes in part, which are somewhat 
more slender than the usual forms of this species. 
“ 10. An enlargement of the base of the specimen, showing the cell-denticles on 
one of the stipes, and a proportionally longer funicle than in fig. 8. 
« 11, An extremely elongated stipe, the lower end showing the commencement of 
growth; the distal extremity is broken. 
oO -T 
«*, Figs. 9 and 10 may possibly prove to be distinct species. (See pl. iii, figs. 11, 12.) 
GRAPTOLITHUS DENTICULATUS, page 88. 
Fig. 12. A small imperfect specimen, preserving three of the stipes. 
«© 13, A larger and more nearly entire specimen, showing the four stipes. Their junc- 
tion at the base is not quite satisfactorily shown. 
“© 14, A part of a single stipe, in which the cellules are well shown on one part; 
while they are compressed and nearly obliterated on the left of the curve. 
© 15, An impression of a part of a stipe which is nearly straight; the imprint of 
the axis or thickened margin is not defined. 
“© 16, An enlargement from figure 14, showing the form of the cell-denticles, and 
the strong marginal axes; one portion represented with the substance 
remaining, and the other as an imprint. 
