. Smithsonian miscellaneous collections . valve showing strong vascular sinuses. U. S. Nat. Mus., Cat. No. 69758.(Xi) Exfoliated ventral valve doubtfully referred to thisspecies. U. S. Nat. Mus., Cat. No. 69759. 5. (X 4.) Dorsal valve. U. S. Nat. Mus., Cat. No. 69760. 6. (X4.) Ventral valve on same surface of limestone as fig. S. Nat. Mus., Cat. No. 69761. (X4-) Exterior of a dorsal valve. U. S. Nat. Mus., Cat. No. 69762.(X 4-) A partially exfoliated dorsal valve. U. S. Nat. Mus., Cat. No. 69756.(Xi) Outer surface of a dorsal valve. U. S. Nat. Mus., Cat. No. 69757.(X 8.) Enlargement of su
. Smithsonian miscellaneous collections . valve showing strong vascular sinuses. U. S. Nat. Mus., Cat. No. 69758.(Xi) Exfoliated ventral valve doubtfully referred to thisspecies. U. S. Nat. Mus., Cat. No. 69759. 5. (X 4.) Dorsal valve. U. S. Nat. Mus., Cat. No. 69760. 6. (X4.) Ventral valve on same surface of limestone as fig. S. Nat. Mus., Cat. No. 69761. (X4-) Exterior of a dorsal valve. U. S. Nat. Mus., Cat. No. 69762.(X 4-) A partially exfoliated dorsal valve. U. S. Nat. Mus., Cat. No. 69756.(Xi) Outer surface of a dorsal valve. U. S. Nat. Mus., Cat. No. 69757.(X 8.) Enlargement of surface to show main ribs intercalated finer ribs or elevated striae, and concentric lines and striae of growth. U. S. Nat. Mus., Cat. No. 69763. The specimens represented by figs. 1, 2, 8 and 9 are from locality64I, Upper Cambrian: Lyell formation. Head of Glacier Lake Can-yon, Alberta, Canada. Figs. 3-7 and 10 are from locality 64t, Lyell formation, SawbackRange, Alberta, Can. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 9, PL. 116. EOORTHIS. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 9, PL. 117
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