130 CANADIAN FOSSILS. 
EXPLANATIONS OF Figures or DENDROGRAPTUS STRIATUS, Hall. 
Puate XVII. 
5. A fragment of a frond, preserving the bases of some of the branches. 
6. A portion of the non-celluliferous surface enlarged. 
Formation and Locality.—Quebec group ;. Point Léyis. 
DENDROGRAPTUS ERECTUS, Hall.: (n. s-) 
Plate XVII, figure.7. 
Description.—Stipe strong, elongated, erect, nearly straight. Branches 
alternate, ascending, and causing at their offset a slight bending or diver- 
gence of the stipe: branches bifurcating, branchlets alternating; all very 
slightly spreading, the stipe maintaining a greater diameter than the branches 
as far as the eighth bifurcation (in the specimen), beyond which it is broken 
off. Cellules visible on the branchlets only as slight expansions, causing an 
undulation on the margins, and in the impressions causing slight identa- 
tions on the surface of the matrix. Surface of the stipe and lower part of 
the branches entirely smooth under an ordinary lens. 
This species differs from all others of the collection in the elongated and 
nearly straight stipe, which maintains its distinction from the branches for 
a long distance above the base. It differs from the strong stipes of D. 
Fruticosus in the almost regularly alternating branches, which are distantly 
and somewhat equally bifurcated. The stipe appears to have been a 
strong cylindrical tube of dense corneous texture, and the lower part of 
the branches have the same character. ‘The compressed specimen is 
marked along the middle of both sides by»a longitudinal groove, which" 
appears to have been produced by the flattening of the stipe. The total 
absence of strize, and apparently of cellules, on the stipe and lower part of 
branches, together with the very slight divergence of the’ branches, 
are features peculiar to this species. - It occurs in the same: association as 
D.. divergens. 
EXPLANATION OF FicurE oF DENDROGRAPTUS ERECTUS, Hall. 
Prate XVII. 
7. The principal stipe, and bases of some of the branches, of the natural size. 
Formation and Locality.— Quebec group ; Point Lévis. 
