Explanation of Plate 



Figs. 1, 2. Char a. Two specimens of a species occurring in a hot spring at 

 Banff, Alberta, x 26. 



Fig. 3. Palaeochara acadica n. sp. Side view x 26. 



Figs. 4, 5, 6. Palaeochara acadica n. sp. View of basal ends of three specimens 

 x26. 



Figs. 7, 8, 9. Palaeochara acadica n.sp. Longitudinal sections of three speci- 

 mens viewed by reflected light. Note position of cellular walls, indicated by trans- 

 verse or oblique lines of parting. Fig. 9 shows possible remnants of a diaphragm 

 separating the neck cavity from the oospore, x 26. 



Fig. 10. Anthrapalaemon hillianus Dawson. Dorsal view of carapace, x 2, 



Fig. 11. Eurypterus (Anthraconectes) brasdorensis n. sp. Dorsal view of cara- 

 pace. X 2. 



Fig. 12. Schistaspis bretonensis n. sp. Dorsal view of holotype. x 2. 



Fig. 13. Schistaspis bretonensis n. sp. Dorsal view of second specimen, x 2. 



Fig. 14. Schistaspis bretonensis n. sp. Drawing of holotype to indicate the 

 fractures and slips within the cephalic shield. The corner ai has slipped under the 

 main body of the shield A. 



