ntain about 1000 feet higher. The E. wall
is tolerably continuous, but is of a very abnormal shape. On the S. there
is a peculiar LAMBDA-shaped gap (with a bright crater, and another less
prominent on the E. side of it), the narrowest part of which opens into a
long wide winding valley, bounded by low hills, extending to the W. side
of a bright ring-plain, Guerike B, on the S.E. A crater-chain occupies
the centre of this valley. There is much detail within Guerike. A large
deep bright crater stands under the E. border on a mound, which,
gradually narrowing in width, extends to the N. wall; and a rill-like
valley runs from the N. border towards the E. side of the LAMBDA-shaped
gap. In addition to these features, there is a shallow rimmed crater,
about midway between the extremities of the rill-valley, and several
minor elevations on the floor.

On the broken N. flank of Guerike is a number of incomplete little rings,
all open to the N.; and E. of these commences a linear group of lofty
isolated mountain masses extending towards the W. side of Parry, and
prolonged for 30 miles or more towards the north. They are arranged in
parallel rows, and remind one of a Druidical avenue of gigantic monoliths
viewed from above. They terminate on the S. side of a large bright
incomplete ring (with a lofty W. wall), connected with the W. side of
Parry.

PARRY.--A more complete formation than Guerike. It is about 25 miles in
diameter, and is encompassed by a bright border, which, at a point on the
E., is nearly 5000 feet in height. It is intersected on the N. by passes
communicating with the interior of Fra Mauro. There is a crater, nearly
central, on the dusky interior, which, under a low sun, when the shadows
of the serrated crest of the W. wall reach about half-way across the
floor, appears to be the centre of three or four concentric ridges, which
at this phase are traceable on the E. side of it. There is a conspicuous
crater on the E. wall, below which originates a distinct cleft. This
object skirts the inner foot of the E. border, and after traversing the
N. wall, strikes across the wide expanse of Fra Mauro, and is ultimately
lost in the region N. of this formation. Parry A, S. of Parry, is a very
deep brilliant crater with a central hill and surrounded by a glistening
halo. A cleft, originating at a mountain arm connected with the E. side
of Guerike, runs to the S. flank of this object, and is probably
connected with that which