. Smithsonian miscellaneous collections . RECENT ALGAE 1. Nostoc sphaericum Vaucher 2. Nostoc pruniforme (Linn.) Agardh 3. Dasya glbbesii Harvey SMITH80NIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 6, PL. 64. 1. Yuknessla simplex Walcott2 Waputikia ramosa Walcott NO. 5 MIDDLE CAMBRIAN ALGAE 255 DESCRIPTION OF PLATE 54 PAGEYUKNESSIA SIMPLEX Wakott 235 Fig. 1. (X2.) Type specimen flattened on the shale. U. S. NationalMuseum, Catalogue No. 35406.*<*. (X 3-) Sketch of specimen illustrated by fig. 1. The specimen represented by figs. 1, 10 is from locality 14s,Middle Cambrian: Ogygopsis zone of th

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. Smithsonian miscellaneous collections . RECENT ALGAE 1. Nostoc sphaericum Vaucher 2. Nostoc pruniforme (Linn.) Agardh 3. Dasya glbbesii Harvey SMITH80NIAN MISCELLANEOUS COLLECTIONS VOL. 67, NO. 6, PL. 64. 1. Yuknessla simplex Walcott2 Waputikia ramosa Walcott NO. 5 MIDDLE CAMBRIAN ALGAE 255 DESCRIPTION OF PLATE 54 PAGEYUKNESSIA SIMPLEX Wakott 235 Fig. 1. (X2.) Type specimen flattened on the shale. U. S. NationalMuseum, Catalogue No. 35406.*<*. (X 3-) Sketch of specimen illustrated by fig. 1. The specimen represented by figs. 1, 10 is from locality 14s, Middle Cambrian: Ogygopsis zone of the Stephen formation;about 2, 300 feet (701 m.) above the Lower Cambrian and 3, 540 feet(1, 089 m.) below the Upper Cambrian, at the great fossil bedon the northwest slope of Mount Stephen, above Field on theCanadian Pacific Railroad, British Columbia. *b. (X3-) The upper portion of a small specimen showing the radiating stipes. U. S. National Museum, Catalogue No. 35407.IC (X4-) Stipes radiating from the summit of the central body of a relatively large specimen. U. S. National Museum, Catalogue No. 35408. Waputikia ramosa Walcott 236 Fig. 2. (X2.) A flexuous stem with branches illustrating the appear-a