98 CANADIAN FOSSILS. 
continues as a single stipe, giving seven as the entire number of stipes, 
with a small seven-sided dise. In another individual we have five stipes only ; 
the funicle and disc exist as in the others, but the subdivisions have taken 
place only on one side, while on the opposite the stipe continues simple. 
The presence or absence of the central disc, however, cannot be reli2d upon 
for specific or other distinction, sce both im this species and G. Logant 
we have specimens of the same species, preserving their characters in all 
respects, except the disc. In the specimen fig. 2, plate viii, we have the 
central portion of an individual in which there is no evidence of the dise 
having existed. In its form and mode of division it corresponds in all 
respects with those specimens possessing the discs; and as it occurs in the 
same association, we cannot suppose it otherwise different. 
In its long linear stipes, this species resembles G. sagittarius (Hall, 
Pal. New York, vol. i, plate 74, fig. 1; perhaps not the European spe- 
cies of that name); but the branches are stronger and the serrations 
coarser ; it is moreover associated with a group of species, all of which are 
quite distinct from the New-York species with which G. sagittarius occurs. 
EXPLANATIONS OF FIGURES OF GRAPTOLITHUS OCTOBRACHIATUS, Hall. 
Prats VII. 
i. A large individual preserving two of the stipes to the length of eight inches, and 
another to nearly the same extent, while the rest are broken off at less 
distances from the disc. The flexibility of their substance is well shown in 
the recurved stipe at the left-hand side of the figures. Although this speci- 
men preserves the most extended stipes of ‘any in the collection, the dise 
is smaller than in several of the other specimens. 
2. The exterior of a large disc of this species, with the stipes broken off a little 
beyond its margin. The two longer portions are so turned as to show the 
cellules. 
A portion of a large disc, showing the exterior or non-celluliferous face of the 
frond, and preserving portions of four of the stipes. 
4. A frond with the stipes broken off at different distances from the centre. The 
substance of the disc or cup is imperfect,—a condition which apparently 
existed while the body was in a living state. 
5. An enlargement from one of the stipes at c, looking upon the apertures of the 
cellules, which are somewhat compressed. 
6. An enlargement from the same at 6, where the substance is laterally compressed. 
7. An enlargement from the same, where the substance is obliquely compressed at a. 
Figs. 5 & 7 are taken from casts made in the impressions left by removal of the sub- 
stance of the graptolite. 
(oN) 
Priate VIII. 
1. A symmetrical frond preserving parts of all the stipes, two of them apparently 
almost entire; several of them had been abruptly bent before being im- 
bedded in the stone. 
2. A frond preserving eight stipes, but without a disc. The specimen does not afford 
any evidence that a disc has ever existed. 
