. Ontario Sessional Papers, 1874, . * The Trimerellidce of the Guelph Formation have been kindly determined for me by Thomas DavidsonEst)., F. R. S., who, in conjunction with Professor King, has made the group the subject of a most exhaus-tive memoir. 67 38 Victoria. Sessional Papers (No. 8.) A. 1874 189. Trimerella acuminata (Billings). Fig. 36. (^<?/. Palaeozoic Fossils, Vol. I., p. 167. Fig. , bis).Locality Formation.—Guelph Formation ; Flora and Fig. 3G TrimereUa acuminata (Billings).Guelph Formation. (After Da rid-son and King.) Triraerelln jrandis (Billing
. Ontario Sessional Papers, 1874, . * The Trimerellidce of the Guelph Formation have been kindly determined for me by Thomas DavidsonEst)., F. R. S., who, in conjunction with Professor King, has made the group the subject of a most exhaus-tive memoir. 67 38 Victoria. Sessional Papers (No. 8.) A. 1874 189. Trimerella acuminata (Billings). Fig. 36. (^<?/. Palaeozoic Fossils, Vol. I., p. 167. Fig. , bis).Locality Formation.—Guelph Formation ; Flora and Fig. 3G TrimereUa acuminata (Billings).Guelph Formation. (After Da rid-son and King.) Triraerelln jrandis (Billings).Guelph (After Da-vidson and King). MonomereUa prisca (Billing^;Guelph Formation. (After I>vidson and King). 190. MONOMERELLA PRISCA (Billiogs). Fig. 38. (Ref. Monomerella prism, Billings, Canadian Naturalist, Vol. p. 221).Locality and Formation.—Guelph Formation ; Elora and Hespeler. 191. Trimerella Dalli (Davidson and King). {Rt>J. Quarterly Journal, Geol. Soc. May. 1874. PI. XV., Figs. 1-3).Locality and Formation.—Guelph Formation ; Elora and Hespeler. 192. Canadensis (^Hall). {Ref. Megalomus Cana/lensis, Hall, Pal. N. Y., Vol. II., PI. LXXX., Figs \a-c; , Figs, la-/; and PI. LXXXIL, la-/.) Casts of this wonderful shell are not at all rare in tiie upper portion of the Guelph For-mation, and sometimes almost form whole beds. Good specimens, however, are not so rea-dily obtainable, and examples in which the actual sh
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