108 CANADIAN FOSSILS. 
The specimens examined have the cellules partially or entirely filled with 
iron pyrites, or other mineral matter, giving a nodose appearance upon the 
surface ; while the back of the specimens, when vertically compressed, is 
likewise nodose. We are not able to associate this form with the others 
according to the rule which we have adopted of commencing with the two- 
stiped forms, and thence going on successively to the more complex, or 
subdivided forms. It is probable however that this one, in its normal 
condition, had a form and mode of growth similar to G. flevilis and G. 
rigidus, but was of much stronger habit in all its parts. 
EXPLANATIONS OF Figures or GRapTouitaus Ricwarpson1, Hall. 
Prats XII. 
1. A fragment of slate, preserving a stipe, with six branches in its apparent con- 
tinuation, and impressions of two others in the intermediate space ; two of 
“these again bifurcating. 
2. A fragment preserving several branchlets, which are compressed in different 
directions, showing the sides and apertures of the cellules. 
3. An impression of a bifurcating fragment, the cellules of which were filled with 
mineral matter and vertically compressed. 
4, <A fragment of a branch laterally compressed. 
5. The impression of a bifurcating branch where the cellules are somewhat obliquely 
compressed, and partially filled with mineral matter. 
6. A fragment enlarged, giving a lateral view of the cellules. 
7. An enlargement from an impression of a branchlet which was obliquely com- 
pressed, having the cellules filled with mineral matter. 
8. Enlargement of a fragment where the cellules are filled with mineral matter and 
vertically compressed. 
Formation and Locality—In the shales of the Quebec group; three 
miles above the river Ste. Anne. 
GRAPTOLITHUS RAMULUS, Hall. (a. s.) 
Plate XII, figures 9, 10. 
Description.—The specimen described consists of a small branch show- 
ing two bifurcations: the substance is extremely thin and much compressed 
in soft finely laminated shale. 
Stipe and branches slender, test thin, greatest width about four hun- 
dredths of an inch ; width of branches half as great. The common body 
occupies nearly one half the entire width of the stipe: branches diverging 
at an angle of 40° to 50°. 
