54 
Figures 
Figures 
Figure 
Figure 
Figure 
Figure 
Figure 
Plate VIII. 
1-5. Zygospira uphami Winchell and Schuchert. (Page 28.) 
Five specimens, 1 and 4 seen from the pedicle, and 
2, 3, and 5 from the brachial side. All from the Colling- 
wood at Craigleith, Ont. Twice natural size. No. 3245. 
6, 7. Clitambonites trentonensis Raymond. (Page 27.) 
Pedicle and cardinal views of the holotype. From the 
middle Trenton at Jessop rapids, BonnechSre river, Ont. 
Twice natural size. No. 1612b. 
8. Pterotheca angusta Raymond. (Page 29.) 
The holotype. From the highest Cobourg beds at 
Collingwood, Ont, Natural size. No. 3266. 
9, Gonularia trentonensis Hall. 
From tne Collingwood at Craigleith, Ont. Natural 
size. No. 3255. 
10. Hormotoma trentonensis Ulrich and Scofield. (Page 28.) 
From the upper Trenton (Cobourg) at Ottawa, Ont. 
Natural size. No. 1678f. 
11. The same species. A small specimen retaining some of the 
surface markings. From the upper Cobourg at Wel- 
lington, Ont. No. 3265. 
12. Fusispira ndbilis Ulrich and Scofield. (Page 29.) 
From the upper Cobourg at Wellington, Ont. Natural 
size. No. 8262, 
