. Cambrian Brachiopoda. Brachiopoda, Fossil. FlGuitE m.—Nisusia (Jamesella) lowi Walcott.—A, A', A", Top, side, and enlarged view (X9) of exterior surface of a partly exfoliated ventral valve, the type specimen, in limestone (U. S. Nat. Mus. Cat. No. 63677a). B, B', B", Top, side, and back views of cast of the interior of a ventral valve, in limestone (U. S. Nat. Mus. Cat. No. 53677b). C, View of the cast of the interior of a small dorsal valve, in limestone (U. S. Nat. Mus. Cat. No. 53677c). D, X compressed dorsal valve in siliceous shale (U. S. Nat. Mus. Cat. No. 57072a). The speci
. Cambrian Brachiopoda. Brachiopoda, Fossil. FlGuitE m.—Nisusia (Jamesella) lowi Walcott.—A, A', A", Top, side, and enlarged view (X9) of exterior surface of a partly exfoliated ventral valve, the type specimen, in limestone (U. S. Nat. Mus. Cat. No. 63677a). B, B', B", Top, side, and back views of cast of the interior of a ventral valve, in limestone (U. S. Nat. Mus. Cat. No. 53677b). C, View of the cast of the interior of a small dorsal valve, in limestone (U. S. Nat. Mus. Cat. No. 53677c). D, X compressed dorsal valve in siliceous shale (U. S. Nat. Mus. Cat. No. 57072a). The specimens represented by figures 61 A, 61B, and 61C are from Locality 58k, and that represented by 61D is from Locality 57m, both in the Lower Cambrian on Mount Stephen, British Columbia. Figure is copied from Walcott [1908d, PI. VIII, fig. 14]. Canadian Pacific Railway just west of the tunnel; and (57m) about 50 feet ( m.) below the Middle Cambrian in a siliceous shale correlated with lb of the Mount Whyte formation on Mount Bosworth [Walcott, 1908f, p. 213], just above the tunnel; all on the north shoulder of Mount Stephen, 3 miles ( km.) east of Field, British Columbia, Canada. (57s) About 160 feet (49 m.) below the Middle Cambrian near the base of the gray oolitic limestone forming lb of the Mount \^Tiyte formation [Walcott, 1908f, p. 212], on Mount Bosworth, north of the Canadian Pacific Railway between Hector and Stephen, on the Continental Divide between British Columbia and Alberta, Canada. NisusiA (Jamesella) nautes (Walcott). Plate XCIII, figures 6, 6a-b. ProtoHhis nautes Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, pp. 283-284. (Characterized and discussed some- what as below as a new species.) This species has the same type of punctate interior surface as N. (J.) spencei, and casts of the exterior are marked by minute, closely set papillte that are casts of the punctas in the shell. Traces of the shell show the same type of papillas and it is highly pro
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