. Smithsonian miscellaneous collections . one of which shows thereticulated surface. U. S. National Museum, CatalogueNo. 64354-2,b. (X6.) Two small ventral valves with very little S. National Museum, Catalogue No. specimens represented by figs. 3, 2>a-b are from siliceous shalesof the Mount Whyte formation (61c) on Mount Odaray, BritishColumbia. Acrothele clitus Walcott 7o Fig. 4. (X 6.) An exfoliated and crushed ventral valve. U. Museum, Catalogue No. (X 6.) A crushed ventral valve with the shell preserved. U. S. National Museum, Catalogue No. 6
. Smithsonian miscellaneous collections . one of which shows thereticulated surface. U. S. National Museum, CatalogueNo. 64354-2,b. (X6.) Two small ventral valves with very little S. National Museum, Catalogue No. specimens represented by figs. 3, 2>a-b are from siliceous shalesof the Mount Whyte formation (61c) on Mount Odaray, BritishColumbia. Acrothele clitus Walcott 7o Fig. 4. (X 6.) An exfoliated and crushed ventral valve. U. Museum, Catalogue No. (X 6.) A crushed ventral valve with the shell preserved. U. S. National Museum, Catalogue No. (X6.) Cast in the shale of the interior of a dorsal valve. U. S. National Museum, Catalogue No. (X6.) Interior of a dorsal valve. (On same piece as 4b.)U. S. National Museum, Catalogue No. specimens represented by figs. 4, 4a-c are from the fine sili-ceous Lake Agnes shale (35e) of the Mount Whyte formation,above the head of Lake Agnes, Alberta. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8/, NO. 3. PL. 0. LOWER CAMBRIAN TRILOBITES AND BRACHIOPODS NO. 3 FAUNA OF THE MOUNT WHYTE FORMATION IOO, PAGE Wimanella catulus Walcott , 70 Figs. 5, 5a. (X I-5-) Top and side view of a ventral valve fromwhich the outer shell is exfoliated. U. S. National Museum,Catalogue No. (X I-S-) Cast of the interior of a ventral valve showing tracesof the great vascular sinuses. U. S. National Museum,Catalogue No. (X i-5-) Cast of the exterior of a dorsal valve. U. Museum, Catalogue No. specimens represented by figs. 5, Sa-c are from oolitic lime-stone near the summit of the Mount Whyte formation (63a), eastbase of Ptarmigan Peak, Alberta. Obolus damo Walcott 69 Fig. 6. (X4-) Exfoliated ventral valve. U. S. National Museum,Catalogue No. (X6.) Cast of interior of a ventral valve. U. S. NationalMuseum, Catalogue No. specimens represented by figs. 6, 6a are from locality 63g,Lower Cambrian: Mount Whyte formation; green
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