. Ontario Sessional Papers, 1874, . .—Trenton Limestone,^eterboro, and Trenton. 27. Strophomena fluctuosa (Billings). (Bef. Palaeozoic Fossils of Canada, Vol. I., p. 123, Fig. 102.)liOcality and Formation.—Trenton Limestone, OoUingwood. 28. Strophomena rhomboidalis (Wahlenberg) Locality and Formation.—Trenton Limestone, Peterboro, and Ottawa. The specimensare usually of comparatively small size. 29. Rhynchonella recurvirostra (Hall). Fig. 6c. {Bef. Atrypa recurvirostra, Hall, Pal. , Vol. I., p. 140, Plate XXXIII., Figs 5a-d.) Locality and Foi-mation.—Very abundant in the Trenton Li
. Ontario Sessional Papers, 1874, . .—Trenton Limestone,^eterboro, and Trenton. 27. Strophomena fluctuosa (Billings). (Bef. Palaeozoic Fossils of Canada, Vol. I., p. 123, Fig. 102.)liOcality and Formation.—Trenton Limestone, OoUingwood. 28. Strophomena rhomboidalis (Wahlenberg) Locality and Formation.—Trenton Limestone, Peterboro, and Ottawa. The specimensare usually of comparatively small size. 29. Rhynchonella recurvirostra (Hall). Fig. 6c. {Bef. Atrypa recurvirostra, Hall, Pal. , Vol. I., p. 140, Plate XXXIII., Figs 5a-d.) Locality and Foi-mation.—Very abundant in the Trenton Limestone of Trenton, Belle-ville, Peterboro, and Ottawa. 30. Rhynchonella. increbresoens (Hall). Fig. Qd.(Bef. Atrypa increbrescens, Hall, Pal. , Vol. I., p. 146, Plate XXXIII., Figs. 13a Locality and —Abundant in the Trenton Limestone,jTrenton, Peterboro, and Ottawa. 31. Orthis plicatella (Hall). (Bef. Hall, Pal, , Vol. 1„ p. 122, Plate XXXII., Figs. 9a y).Locality and Formation.—Trenton Limestone, Fig. 6. <?, A small example of Dinoholas mugniHcus (Billings). 6, (Billings) (after Billings), c, RkynchoneVa {Zt/gospira ?)recurvirostra (Hall) ; dorsal view, c, Profile view of the .^amrf. c,Ventral view of the same, d, Rhi/nchonelfninrrehi-escens (Hall) ; dorsalview, d, Profile view of the same. Trenton Limestone. 32. Orthis plabellulum (Sowerby). Locdity and Formation.—Trenton Limestone, 17 38 Victoria. Sessional Papers (No. 8.) A. 1874 33. DiNOBOLUS MAGNIFICUS (BiUings). Fig. 6fl. Obolus Canadensis, (Billings), Mem. Geol. Survey of Canada, Report foi 1857, Fig. 19(caet. exclusis.) , Oholtllina magnifica, (Billings), Canadian Naturalist April, 1872, p. 17, Fig. 7. Dinobolus magnificus, (Davidson and King), Quart. Journ , Geol. Soc, May, 1874. Locality and Fotmatmi.—Trenton Limestone, Trenton. I have seen no more than twowell preserved dorsal valves. 34. Trematis Ottawaensis (Billings). (Bef. Palseoz
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