GRAPTOLITES: - Led 
Denprocraptus Haniianvs, Prout. 
a. A portion of the frond, of the natural size. 
b. An enlargement of one of the branchlets, showing the cellules. 
c. The main stipe and some of the principal branchlets, natural size. There is an 
expansion or protuberance at the base or radicle, one side of which is broken off. 
DENDROGRAPTUS. FLEXUOSUS, Hall. (a. s.) 
Plate XVII, figures 1, 2. 
Description.—Frond broadly expanding. Stipe short, flexuous, branch- 
ing near the base: branches somewhat regularly bifurcating, the divisions 
sub-equal in strength and equally diverging. Stipe and branches flatten- 
ed, (round in their original form,) very gradually diminishing towards their 
extremities, flexuous, the margins of the lower ones scarcely undulating ; 
the upper ones more distinctly undulating, and sometimes showing the cell- 
denticles when viewed upon the non-celluliferous side. Cellules long, 
narrow, extremities free: cell-denticles angular, about thirty-three in the 
space of an inch. 
This species is less robust than D. fruticosus, the stipe more flexu- 
ous, the branches proportionally broader, their divergence more equal and 
at a greater angle, giving a wider expansion to the frond. ‘The branches 
