forty-sixth case is also covered with calcites, including the
reastone, the limestone incrusted upon a human skull, found in the
Tiber at Rome. In the 47th case are varieties of carbonate of
magnesia, and magnesian limestone, including a remarkable one from
Massachusetts. Some marble tables are also in this room, placed here
to exhibit the beauties of various calcites. The table of Serpentine
is here: also the table inlaid with porphyries; one with a series of
bivalve shells (25); and in the centre of the room is the stalagmitic
table, from the Blythe lead mine, Derbyshire, with black marble legs
from Bakewell, given to the trustees of the Museum by the Duke of
Rutland. Before leaving this room the visitor should not fail to
notice the Maidstone Iguanodon deposited in a bed of sandstone, and
placed beneath the central north window of the room. The bones are
disjointed, but the general form of the reptile may be more perfectly
seen here than in any other fossil remains of the iguanodon. Having
noticed this fossil, and remarked the classed groups of gigantic dark
fossil bones, which cover the southern wall, the fossil turtles from
Sussex and other parts, and the great fossil thigh bones of reptiles
that have passed long since from the face of the earth, the visitor
should once more advance into the fourth room of the gallery.

In this room the wall cases are devoted to

FOSSIL ANIMALS.

Of these the most interesting specimens are the remains of the Marine
Lizards known as ichthyosauri from the English lias formation. To the
right on entering, against the eastern wall of the room, the visitor
should first notice the fossil remains of various carnivorous animals,
including the skulls and other osseous wrecks of hyenas, bears, &c.,
and also, carefully screened in an additional glass case, hereabouts,
the lower jaw of a marsupial animal on a slab of oolitic limestone--an
early deposit, in which the highest class fossils generally found are
the tortoises.

In this room, however, the visitor will notice the progress of early
creation--first, the zoophytes; then the fish lizards; then the fossil
ruminants; then the fossil carnivora. Examples of these fossil remains
are all included in the room which the visitor has now reached. First,
he should examine the fossil remains of the ichthyosauri, or fish
lizards, ranged in the first three wall cases, particularly that
eighteen feet in length, deposited in the third case, one on