hrough the wall and
trend towards Lohrmann. There is a considerable ring-plain at the inner
foot of the N.E. wall, but, except this and a few longitudinal ridges,
just visible under a very low sun, there is apparently no other object to
vary the monotony of this great expanse.

DAMOISEAU.--Consists of a complex arrangement of rings, an enclosure 23
miles in diameter, with a somewhat smaller enclosure placed excentrically
within it (the N. side of both abutting on a bright plateau), with two
large depressions intervening between their W. borders. This peculiarity,
almost unique, renders the formation an especially interesting object.
Damoiseau is situated on the W. side of Grimaldi, on the E. coast-line of
the Oceanus Procellarum, from which the S.W. border rises at a gentle
inclination. On the N.W. there is a curious curved inflexion of the Mare,
bounded by a bright cliff, representing probably the E. side of a
destroyed ring, a supposition which is strengthened by the existence of a
faint scar on the surface of the sea, extending in a curve from one
extremity of the bay to the other, and thus indicating the position of
the remainder of the ring. A conspicuous little crater stands at the S.
end of it, and two others some distance to the W. The smaller component
of Damoiseau contains a low central ridge.

RICCIOLI.--An immense enclosure, near the limb, N.E. of Grimaldi, bounded
by a rampart which is very irregular both in form and height, though
nowhere of great altitude, and much broken by narrow gaps. It is
especially low and attenuated on the N., where a number of ridges with
intervening valleys traverse it. On the S. also a wide valley cuts
through it. With the exception of a few low rounded hills and ridges, a
short crater-row under the S.E. wall, and two small craters on the S.W.,
there are no details on the floor, which, however, is otherwise
remarkable for the dusky tone of its surface, especially on the N. This
dark patch occupies the whole of the N.E. side of the interior, and is
bounded on the S. by an irregular outline, extending at one point nearly
to the centre, and on the W. by a curved edge. The W. side is much darker
than the rest. It is, in fact, as dark, if not darker, than any part of
the floor of Grimaldi. Riccioli extends 106 miles from N. to S., and is
nearly as broad. It includes an area of 9000 square miles.

ROCCA.--An irregular formation, 60 miles in length, near the limb S.E. of
Grimaldi, co