90 CANADIAN FOSSILS. 
14. GRAPTOLITHUS FRUTICOSUS, Hall. 
Plate V, figures 6-8; and Plate VI, figures 1-3. 
(G. FruTicosus : Geological Survey of Canada, Report for 1857, page 128.) 
Description.—Frond consisting of two pairs of ascending and slightly 
curved stipes arising from the two sides of a long slender radicle, which is 
divided above: the stipes are celluliferous on the inner or adjacent mar- 
gins, little divergent at the bifurcation, and continuing for a half or two 
thirds of theirlength nearly straight ; above this they curve gently outwards, 
presenting, when not distorted, a very beautiful and symmetrical form. The 
stipes gradually increase in width from their origin, being at the base one 
fiftieth of an inch, and in the widest part one twelfth of an inch, exclusive 
of the denticle. The proportion of the stipe occupied by the common body 
is extremely narrow. 
Surface smooth, or with scarcely visible striz: at the lines of the cell- 
partitions: axis very slender; test thin and fragile. Radicle half an inch 
in length. Cellules short and broad, making an angle with the axis of 
about 38°; the length from two to three times the diameter, and free from 
a third to a half of the entire length, according to their development ; 
variably curving in different parts of the stipe. Aperture wide, apex pointed, 
scarcely mucronate, and sometimes acutelyrounded. About fifteen cellules 
in the space of an inch, varying slightly in different parts of the stipe: near 
the base the serrature or length of the denticle is equal to the width of the 
stipe, while in the wider portions it is less than half the width of the stipe. 
This species, in all the examples that have been observed, is a very 
distinct and easily recognized form. Wherever the radicle is preserved, 
it is longer than in any of the other species: this part bifurcates above, 
and the divisions, moderately diverging, represent what I have termed the 
funicle in the quadribrachiate forms; from each extremity of this, the 
stipes originate. All the divisions are little divergent, and the frond grows 
upwards like a small shrub. The form of the cellules differs from other 
species here described, except perhaps G. indentus, which is readily dis- 
tinguished in its mode of growth, as well as by other characteristics. 
EXPLANATIONS OF FiguRES OF GRAPTOLITHUS FRUTICOSUS, Hall. 
PuaTe V. 
6. A small individual with the radicle and extremities of the stipes broken off. 
7, Anenlargement from fig. 6. The serratures are either imperfect or shrunken, 
and do not present the characters seen in better-preserved specimens. 
8. An individual nearly entire, but badly preserved in the outline of its parts. 
