EXPLANATIONS OF PLATE A, continued. 
Cuimacogrartus (sub-genus DicRANOGRAPTUS) RAMOSUS, pages 15, 31, 45, 46, and 112. 
(Graptolithus ramosus, Paleontology of New York, vol. i, page 27, and Geology 
of Canada, page 200.) 
Fig. 18. The lower part of a frond in which the base is entire, with the bifurcation 
above, (natural size). 
‘¢ 19. The bifurcating portion, with a part of the simple stipe, showing the cells on 
one side as they are usually seen when flattened in the slate. On one por- 
tion of this there are oval pustules, which is a feature sometimes observed. 
The opposite side gives the appearance of the cellules when flattened and 
compressed partially against the aperture, (six diameters). 
“20. An enlargement from below the bifurcation, showing the more perfect form of 
the aperture, with the spines proceeding from the exterior surface above 
the aperture, (enlarged to six diameters) ; see page 31. 
21, A young individual or germ, supposed to be of this species, showing the basal 
processes and the partially developed cellules at the upper part. See 
page 34. 
