128 CANADIAN FOSSILS. 
are not so distinctly undulated by the projection of the cells, and whenever 
these are visible, the form of the aperture or cell-denticle is a distinguish- 
ing feature. 
In a specimen of coarse greenish or olive shale, which contains this 
species, we find also a few fragments of graptolites, among which we 
recognize G. bryonoides ; and in another specimen of coarse brown shale, 
we find it associated with Phyllograptus typus and Dendrograptus 
Sruticosus. 
EXPLANATIONS OF Figures or DENDROGRAPTUS FLEXUOSUS, Hall. 
Puate XVII. 
1. A small frond of the natural size. 
2. A part ofa larger frond. 
The characters of the cellules and denticles referred to in the deserip- 
tion, are derived from some branchlets of the specimen figure 2, which show 
these features in a very satisfactory manner. ‘The illustration was unin- 
tentionally omitted from the plate, and is given in the accompanying figure. 
3. An enlargement of some of the branchlets of Dendrograptus flexuosus, 
Formation and Locality—Quebec group; Point Lévis. 
