GRAPTOLITES. 111 
DIPLOGRAPTUS INUTILIS, Hall. (n. 8.) 
Plate XIII, fig. 14. 
Description.—Stipes, small and obscure, cellules angular, the free por- 
tions extending almost rectangularly to the axis, and produced into sub- 
mucronate points. The cell-divisions cannot be traced beyond the serra- 
tures. The solid axis is slender, and extended beyond the celluliferous 
portion of the stipe. 
These specimens occur as short stipes which preserve an extension of 
the solid axis, sometimes as great as the celluliferous portion. The 
distinguishing features are the angular extensions of the cellules, which 
are nearly equilateral, and sometimes slightly mucronate at their ex- 
tremities. 
This species occurs with Climacograptus antennarius and Retrograptus 
ensiformis, and has been observed in only a few specimens. 
Formation and Locality.—Quebec group ; Point Lévis. 
Genus CLIMACOGRAPTUS, Hall. (n. g.) 
Simple stipes with sub-parallel margins, having a range of cellules on 
each side; axis filiform; cellules short and square ; apertures apparently 
excavated in the margin of the stipe, and transversely oval or sub- 
quadrate ; cell-denticles or appendages, if present, usually on the upper 
side of the aperture. 
Several species of this type at present known are simple stipes with 
nearly parallel sides, marked by transversely-oval or quadrangular cell- 
apertures, which, when compressed against the body of the stipe, give the 
appearance of those forms described by Linnzeus and subsequent authors 
as Graptolithus scalaris. In one species, where the stipe apparently 
preserves its natural proportions, the shorter diameter is about three fifths 
the longer diameter, and the axis is slender and filiform. In several 
of the species the axis is seen extending below the base of the 
cellules; while there is often a more or less extended oblique process 
from each side at the base, as shown in C. antennarius and C. bicornis. 
(Pl. xxii, figs. 11,13; and pl. A, figs. 13, 15, 16, and 17.) 
These species are separated from such forms as G. pristzs on account 
of the difference in form of cellules, or rather of cell-apertures, since the 
limit between the cellule and the body of the stipe is not easily observed in 
