d ring, nearly
concentric with the principal rampart, and separated from it by an
interval of nine or ten miles. The most prominent object, however, is the
bright crater a little E. of the centre. This is partially surrounded on
the W. by three or four small bright mountains, through which runs in a
meridional direction a rill-valley, not easily traced as a whole, except
under a low sun. There is another cleft on the N.E. side of the interior,
which is an apparent extension of part of the inner ring, a transverse
rill-valley on the N., a fourth _quasi_ rill on the N.W., and a fifth
short cleft on the S. part of the floor. Between the principal crater and
the S.E. wall are two smaller craters, which are easy objects. Beyond the
border on the N., in addition to Daniell, are four conspicuous craters
and many ridges.

CHACORNAC.--This object, connected with Posidonius on the S.W., is
remarkable for the brilliancy of its border and the peculiarity of its
shape, which is very clearly that of an irregular pentagon with linear
sides. I always find the detail within very difficult to make out. Two or
more low ridges, traversing the floor from N. to S., and a small crater,
are, however, clearly visible under oblique illumination. Schmidt draws a
crater-rill, and Neison two parallel rills on the floor,--the former
extends in a southerly direction to the W. side of Le Monnier.

DANIELL.--A bright little ring-plain N. of Posidonius. It is connected
with a smaller ring-plain on the N.W. wall of the latter by a low ridge.

BOND, G.P.--A small bright ring-plain 12 miles in diameter, W. of
Posidonius. Neison shows a crater both on the N. and S. rim. Schmidt
omits these.

MAURY.--A bright deep little ring-plain, about 12 miles in diameter, on
the W. border of the Lacus Somniorum. It is the centre of four prominent
hill ranges.

GROVE.--A bright deep ring-plain, 15 miles in diameter, in the Lacus
Somniorum, with a border rising 7000 feet above a greatly depressed
floor, which includes a prominent mountain.

MASON.--The more westerly of two remarkable ring-plains, situated in the
highlands on the S. side of the Lacus Mortis. It is 14 miles in diameter,
has a distinct crater on its S. wall, and, according to Schmidt, a crater
on the E. side of the floor.

PLANA.--A formation 23 miles in diameter, closely associated with the
last. Neison states that the floor is convex and higher than the
surrounding region. It has a triangular-shape