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Figs. 1, 2. Chara. 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 x 26.

Figs. 7, 8, 9. Palaeochara acadica n. sp. Longitudinal sections of three specimens viewed by reflected light. Note position of cellular walls, indicated by transverse 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 carapace. 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. x2.

Fig. 14. Schistaspis bretonensis n. sp. Drawing of holotype to indicate the fractures and slips within the cephalic shield. The corner a1 has slipped under the main body of the shield A.