. Cambrian Brachiopoda. Brachiopoda, Fossil. SYNTROPHIIDiE. 807 HUENELLA ETHERIDGEI Walcott. Plate LXXXIX, figures 9, 9a. Orthis (or Orthisina) sp. Etheridge, 1905, Trans. Roy. Soc. South Australia, vol. 29, p. 250, PI. XXV, figs. 9 and 10. (Described as below and discussed. The specimens represented by figs. 9 and 10 are redrawn in this monograph, PI. LXXXIX, figs. 9 and 9a, respectively.) Huenella etheridgei Walcott, 1908, Smithsonian Misc. Coll., vol. 53, No. 3, pp. 109-110, PL X, figs. 13 and 13a. (Described and discussed as below, copying the original descriptions. Figs. 13 and 13a are dr
. Cambrian Brachiopoda. Brachiopoda, Fossil. SYNTROPHIIDiE. 807 HUENELLA ETHERIDGEI Walcott. Plate LXXXIX, figures 9, 9a. Orthis (or Orthisina) sp. Etheridge, 1905, Trans. Roy. Soc. South Australia, vol. 29, p. 250, PI. XXV, figs. 9 and 10. (Described as below and discussed. The specimens represented by figs. 9 and 10 are redrawn in this monograph, PI. LXXXIX, figs. 9 and 9a, respectively.) Huenella etheridgei Walcott, 1908, Smithsonian Misc. Coll., vol. 53, No. 3, pp. 109-110, PL X, figs. 13 and 13a. (Described and discussed as below, copying the original descriptions. Figs. 13 and 13a are drawn from the specimens represented by figs. 9 and 10 of the preceding reference and are copied in this monograph, PL LXXXIX, figs. 9a and 9, respectively.) Doctor Etheridge describes the ventral valve as follows: Subquadrilateral, convex, the greatest convexity at about midway in the length of the valve, the sinus gradually deepening and widening toward the front, and bounded laterally by ill-defined folds, one on either side, the surface sloping away on either side rapidly to the lateral margins, and at a very much less angle within the sulcus; there are indications of costse on the divaricating folds and in the sulcus. The hinge features are hidden in matrix, nor is the umbo distinctly visible. He describes the dorsal valve as follows: Rotundato-quadrate, the cardinal margin as long as the width of the valve, the surface convex, except on the dorso-lateral alations, where it appears to be flattened. There is a central, acute, or pinched-up fold, produced forward, and expanding as it advances. There are indications of the existence of strong, distinct, subradiating costse. Whether or no this is the brachial valve of the species represented by the preceding form it is at present impossible to say; the two occur in the same bed, however. From the study of the various forms of Huenella described herein, I think that the two valves belong to one species, and I take pleasure in nam
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