. Ontario Sessional Papers, 1874, . tiU fur- gpaces—a group which will probably be found to be of at tner emarged. (Jlinton 1 ormation. ^ » i r j least sub-generic value. It is, however, just possible that thelarger openings in the ccenoecium are not the apertures of cells, but actual perforations passingthrough the whole thickness of the frond, in which case the fossil would be a very aberrantmember of the Fenestellidce. There is, however, no direct evidence to support this view ; andbut for the porous or punctate intercellular spaces, the fossil has all the characters and appearance
. Ontario Sessional Papers, 1874, . tiU fur- gpaces—a group which will probably be found to be of at tner emarged. (Jlinton 1 ormation. ^ » i r j least sub-generic value. It is, however, just possible that thelarger openings in the ccenoecium are not the apertures of cells, but actual perforations passingthrough the whole thickness of the frond, in which case the fossil would be a very aberrantmember of the Fenestellidce. There is, however, no direct evidence to support this view ; andbut for the porous or punctate intercellular spaces, the fossil has all the characters and appearance of one of the explanate Ptilodidyce. Locality and Formation.—Clinton Group, Dundas. 109. Leptoc(eli plano-convexa (Hall). Fig. 21a.(Ref. Atrypa plano-cmvexa, Hall, Pal. N. Y., Vol. II, PI. XXIII. Figs. 11 a—h).Abundant in the Clinton Group at Dundas and Hamilton. 110. Athtris (^Atrypa) naviformis (Hall). {Bef. Pal. Vol. II, PI. XXIV. Figs. 1 Or—k).Clinton Group, Dundas. 111. Atrypa reticularis (Linn).Clinton Group, Dundas. 46. 38 Victoria. Sessional Papers (No. 8.) A. 1874 112. Rhynchonella neulecta (Hall). Fig. 216, b. (Ref. Pal. N. Y., Vol. II, PI. XXIII. Fig. 4 «—/and PI. LVII. Fig. 1 a—p).Clinton Group, Dundas.
Size: 2291px × 1091px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorontariol, bookcentury1800, bookdecade1870, bookyear1874
