. Ontario Sessional Papers, 1874, . 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 shell is preserved, are of comparativelyrare occurrence. The largest cast in my pos
. Ontario Sessional Papers, 1874, . 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 shell is preserved, are of comparativelyrare occurrence. The largest cast in my possession has a length of five and a half inches,and a width of four and a half inches, the depth of both valves being three and a half smallest cast in my possession, has a length of two inches and a width of one inchand three-quarters, the depth of the closed valves being one inch and four lines. Locality and Formation.—Guelph Formation ; , Ehra, Gait, and Guelph. (JS 38 Victoria. Sessional Papers (No. 8.) A. 1874. 193. Megalomus compressusJ(Nicholson and Hinde). Megalomus cmnpressus, Nicholsonand Hinde, Canadian Journal, April, S74. Shell equivalve, valves compressed,the depth of both valves being littlemore than one-third of the elliptical, the length nearlyone-third greater than the anterior, incrassated, withapparently one cardinal and twolateral teeth. A single, deep, con-centrically-striated muscular impres-sion placed just in front of and be-neath the umbones, with a small cir-cular pit above it. Pallial line sim-ple. Surface of the shell unknown. Fig. 39. Megalomus Canadensis (Hall) ; a, Side-view of cast; b, Dorsalview of the same ; c, Anotlier specimen in which the shell is pre-served. All reduced one-half. Guelnh Fnrmation. In many respects this singu-lar species agrees with M. Cana-densis (Hali); from which, how-ever, it is clearly distinct. It isonly known to us by the cast,which is entirely free from dis-tortion, an
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