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

Rh 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.