As a considerable number of changes in the names and disposition of species have been made in the present paper, the following list of changes is presented for the convenience of users of previous literature:

Acer, fruit of, Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 15, Acer oregonianum, n. sp.

Acer trilobatum productum (Al. Br.) Heer. Lesq., Cret. and Tert. Fl., Pl. LIX, figs. 1, 2, 4 = Acer Bendirei Lesq.; fig. 3 Platanus dissecta Lesq.

Aralia pungens Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 16 = Artocarpus californica? Knowlton.

Carpinus pyramidalis (Göpp.) Heer. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 18 = Carpinus grandis? Unger.

Carpinus, involucre of = Betula heteromorpha.

Carya elœnoides (Ung.) Heer. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 18 = Hicoria elœnoides (Ung.) Knowlton.

Cassia phaseolites? Unger. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 16 = Salix Engelhardti Lesq.

Castanea atavia Unger. Lesq., Cret. and Tert. Fl., p. 247, Pl. LII, fig. 2 = Quercus horniana Lesq.

Diospyros lancifolia Lesq. = D. alaskana Schimp.

Equisetum Hornii Lesq. = E. oregonense Newb.

Fagus castaneaefolia Unger. Lesq., Proc. U.S. Nat. Mus., Vol. XI, p. 18 = Fagus? sp.

Ficus? Condoni Newb.= Platanus Condoni (Newb.) Knowlton.

Fraxinus affinis Newb.= Quercus affinis (Newb.) Knowlton.

Ilex longifolia Heer. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 21 = Juglans? Bendirei Knowlton.

Juglans hesperia Knowlton = J. oregoniana Lesq.

Lastrea Knightiana Newb. = Lastrea Fischeri Heer.

Liquidambar europœum Al. Br. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 14 = L. europœum patulum, n. var.

Lygodium neuropteroides Lesq. = L. Kaulfusii Heer.

Marsilea Bendirei Ward = Hydrangea Bendirei (Ward) Knowlton.

Myrica diversifolia Lesq., Cret. and Tert. Fl., Pl. L., fig. 10 = Crataegus flavescens Newb.

Myrica Lessigii? Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 16 = Artocarpus californica? Knowlton.

Paliurus colombi Heer. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 16 = Grewia crenata (Unger.) Heer.

Platanus Raynoldsii Newb. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 19 = Platanus sp.

Populus monodon Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 21 = Magnolia Culveri Knowlton.

Populus polymorpha Newb., in part = Betula heterodonta Knowlton, Quercus pseudo-alnus Ett., and Quercus oregoniana Knowlton.

Porana Bendirei (Ward) Lesq. = Hydrangea Bendirei (Ward) Knowlton.

Pteris pinnaeformus Heer. = P. pseaudo-pinnœformis Lesq.

Pteris subsimplex Lesq. = Asplenium subsimplex (Lesq.) Knowlton.

Quercus Breweri Lesq., Cret. and Tert. Fl., Pl. LIV, fig. 9 = Q. affinis (Newb.) Knowlton

Quercus furvinervis (Rossm.) Unger. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 22 = Q. furcinervis americana Knowlton.

Quercus pseudo-lyrata acutiloba Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 17 = Q. pseudo-lyrata Lesq.

Quercus pseudo-lyrata angustiloba Lesq., op. cit., p. 17 = Q. Merriami Knowlton

Quercus pseudo-lyrata brevifolia Lesq., op. cit., p. 18 = Q. pseudo-lyrata Lesq.

Quercus pseudo-lyrata latifolia Lesq., op. cit., p. 18 = Q. pseudo-lyrata Lesq.

Quercus pseudo-lyrata obtusiloba Lesq., op. cit., p. 18 = Q. pseudo-lyrata Lesq.

Rhus Bendirei Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 15 (the small leaflet described) = Juglans oregoniana Lesq.

Sequoia Nordenskiöldii Heer. Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 19 = S. angustifolia Lesq.

Taxodium distichum miocenum Heer. Newberry, Later Extinct Floras, Pl. XLVII, fig. 6 = Sequoia Langsdorfii (Brgt.) Heer.

Ulmus pseudo-americana Lesq. = U. speciosa Newb.

Ulmus speciosa Newb., Later Extinct Floras, Pl. XLV, figs. 5, 8 = Ulmus Newberryi Knowlton.