Page:Canadian Alpine Journal I, 2.djvu/91

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245
Mt. Stephen Rocks and Fossils

ACROTRETA DEPRESSA (Walcott)

 Figs. 3 and 3a. Top and side views of an elevated ventral valve.
 Fig. 3b. Cast of the interior of a dorsal valve.
 Fig. 3c. Cast of the interior of a ventral valve.

NISUSIA ALBERTA (Walcott)

 Fig. 4. A cast of the exterior surface showing bases of surface spines.
 Fig. 4a. A compressed valve.

PHILHEDRA COLUMBIANA (Walcott)

 Figs. 5 and 5a. Top and side views, greatly enlarged. (Very rare).

SCENELLA VARIANS Walcott

 Fig. 6. Top view of a specimen with the apex nearer the center than usual.

STENOTHECA WHEELERI, new species.

 Fig. 7. Side view of the type specimen. (Comparatively rare).

HYOLITHELLUS FLAGELLUM (Matthew)

 Fig. 8. A long curved specimen.
 Fig. 8a. A slender nearly straight specimen.

HYOLITHELLUS ANNULATA (Matthew)

 Fig. 9. A large specimen with a group of small tubes adjoining it.
 Fig. 9a. Enlargement of a portion of the specimen represented by figure 9. The small tubes are much like those of Hyolithellus flagellum.