GRAPTOLITES. 129 
DENDROGRAPTUS DIVERGENS, Hall. (u.s.) 
Plate XVII, figures 3, 4. 
Description—A fragment of a frond of this species shows a flexuous 
stipe of moderate strength, with slender bifurcating branches, the divisions 
numerous and widely diverging: cellules arranged in alternating order on 
the opposite margins of one face of the stipe ; non-celluliferous face very 
obscurely striated. 
This species differs from all the others in its regular bifurcation, and in 
the wide divergence of the branches. The specimen.is extremely com- 
pressed, and the cellules are only determined by indentations in the shale. 
Tt occurs in the same shales with D. erectus, Graptolithus Logani, G. 
quadribrachiatus, G. denticulatus, G. arcuatus, G. Bigsbyt, and others. 
EXPLANATION OF FiguRES oF DENDROGRAPTUS DIVERGENS, Hall. 
Puate XVII. 
3,4. A specimen of natural size, and an enlargement of the same. 
Formation and Locality.—Quebec group; Point Lévis. 
DENDROGRAPTUS STRIATUS, Hall. (un. s.) 
Plate XVII, figures 5-6. 
Description.—Frond numerously branched, spreading. Stipe below the 
branches unknown. Branches cylindrical, tubular, substance thick and 
strong: branches and branchlets moderately diverging ; non-celluliferous 
side finely striated longitudinally ; striz continuous, gently undulating. 
Celluliferous face striated : cellules minute, arranged in an alternating series, 
or in an undulating line, upon one face of the branches. The indenta- 
tions left in the shale give an appearance as of a single linear range of 
cellules. Cellules in the proportion of thirty-six to an inch. 
This species is readily distinguished by its striated surface. In mode 
of branching it resembles D. erectus; but differs in the strize, and in having 
cellules on the lower part of the branches. The specimen is in a greenish- 
_ olive shale. 
