_Trematis_.
Trenton Limestone.
_Trianthrus Beckii_.
Triassic period; rocks of, in Britain; in Germany; in the
Austrian Alps; in North America; life of.
_Triconodon_.
_Trigonia_.
_Trigoniadoe_.
_Trigonocarpum; ovatum_.
Trilobites; of the Cambrian; of the Lower Silurian; of the
Upper Silurian; of the Devonian; of the Carboniferous.
_Trimerellidoe_.
_Trinucleus; concentricus_.
_Trionycidoe_.
_Triton_.
_Trochocyathus_.
_Trochonema_.
_Trogontherium; Cuvieri_.
Trumpet-shells.
Tulip-tree.
_Turbinolia sulcata_.
_Turbinolidoe_.
_Turrilites; catenulatus_.
_Turritella_.
Turtles.
_Typhis tubifer_.
_Ullmania selaginoides_.
Unconformability of strata.
Under-clay of coal.
_Ungulata_, of the Eocene; of the Miocene; of the
Pliocene; of the Post-Pliocene.
Uniformity, doctrine of.
_Unio_.
Univalves (_see_ Gasteropoda).
Upper Cambrian; Chalk; Cretaceous; Devonian; Eocene; Greensand;
Helderberg; Laurentian; Llandovery; Ludlow rock; Miocene;
Oolites; Silurian period; rocks of, in Britain; in North
America; life of.
_Ursus arctos; Arvernensis; ferox; speloea_.
_Ursus_.
Valley-gravels, high-level and low-level.
_Vanessa Pluto_.
_Varanidoe_.
Vegetation (_see_ Plants).
_Ventriculites; simplex_.
Venus's Flower-basket.
_Vermilia_.
_Vespertilio Parisiensis_.
Vicksburg Beds.
Vines.
Vitreous Sponges.
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