134 CANADIAN FOSSILS. 
CALLOGRAPTUS ELEGANS, Hall. (n. s.) 
Plate XIX, figures 1-4; and Plate XVIII, figure 4. 
Description.—Frond broadly flabelliform. Stipe short, flexuous, swelling 
at the base or root. Branches originating near the root, becommg numer- 
ously subdivided, the divisions slghtly divergmg or nearly parallel, while 
the whole expands to a somewhst semi-circular form when entire. After 
the second or third bifurcation the branches become very slender, and con- 
tinue of nearly equal width. Non-celluliferous face strongly striated, 
slightly swelling at the cellules: celluliferous face striated; the cellules 
arranged alternately on the opposite margins, parallel or slightly diverg- 
ing, and opening in a projecting process or cell-denticle, of undetermined 
form. 
This species differs from Dendrograptus fruticosus in its more regu- 
larly-branching habit, less divergence of branches in mature specimens, 
shorter stipe, and more regular flabellate form. It differs from D. flex- 
wosus in the more numerous, more slender, and less diverging branches 
and branchlets. From both it differs in the form of the cells, and in the 
strongly-striated non-celluliferous face of the frond. In young individuals 
the branches are often much more divergent, but the striated surface and 
the arrangement of the cellules correspond in all. 
The specimens of this species occur in a fine grayish slate, associated 
with Graptolithus nitidus, G. constrictus, G. bryoncides, and G. octobra- 
chiatus. 
EXPLANATIONS OF FIGURES oF CALLOGRAPTUS ELEGANS, Hall. 
PuatTe XIX. 
1. A fragment ofa frond, natural size. 
A nearly entire flabelliform frond. The two shaded lines running nearly ver- 
tically through the figure, are due to faults or slips in the slate, causing a 
slight overlapping of the laminz, and an interruption of the continuity of 
the frond. 
3. Anenlargement, showing the lateral connection of the branches at irregular 
intervals. 
4. A further enlargement of the non-celluliferous side of a bifurcating branchlet, 
showing the striated surface and a semi-articulate structure. 
Puats XVIII. 
4, A fragment which is more lax and spreading, with shorter branchlets 
than the ordinary specimens, but having similar strie, and a similar arrange- 
ment of cellules. 
Formation and Locality.—Quebec group ; Gros Maule. 
