. Smithsonian miscellaneous collections . 14 13a 14 a SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 9, PL. 111. NISUSIA-WIMANELLA-BILLINGSELLA-PROTORTHIS. NO. 9 CAMBRIAN AND OZARKIAN BRACHIOPODA 539 DESCRIPTION OF PLATE in PAGE Nisusia alberta Walcott 499 Figs. I, la. (X 2.) Top and side view. U. S. Nat. Mus., Cat. The specimens represented by figs. 1 and la are from locality 14s,Middle Cambrian : Stephen formation ; Mount Stephen, above Field,B. C, Can. IVimanella borealis Walcott 501 Fig. 2. (X4-) Portion of an exfoliated ventral valve with faint vas-cular sinuses. U. S. Nat.
. Smithsonian miscellaneous collections . 14 13a 14 a SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 9, PL. 111. NISUSIA-WIMANELLA-BILLINGSELLA-PROTORTHIS. NO. 9 CAMBRIAN AND OZARKIAN BRACHIOPODA 539 DESCRIPTION OF PLATE in PAGE Nisusia alberta Walcott 499 Figs. I, la. (X 2.) Top and side view. U. S. Nat. Mus., Cat. The specimens represented by figs. 1 and la are from locality 14s,Middle Cambrian : Stephen formation ; Mount Stephen, above Field,B. C, Can. IVimanella borealis Walcott 501 Fig. 2. (X4-) Portion of an exfoliated ventral valve with faint vas-cular sinuses. U. S. Nat. Mus., Cat. No. 69705. 3. (X 4-) A small ventral valve with acute cardinal angles. U. S. Nat. Mus., Cat. No. 69706. 4. (X4-) Exfoliated dorsal valve with acute cardinal angle. U. S. Nat. Mus., Cat. No. 69707. The specimens represented by figs. 2-4 are from locality 6iv, MiddleCambrian : Titkana formation; gray shaly limestone, Robson PeakDistrict, Alberta, Can. Wimanella occidens Walcott 501 Fig. 5. (X 4-) Natural casts of interior of ventral valves. U. S. , Cat. No. 69708. 6. (X 4-) Natural cast of inte
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