CLAIRAUT.—­A very peculiar formation, about 40 miles in diameter, S. of Maurolycus, affording another good example of interference and overlapping.  The continuity of its border, nowhere very regular, has been entirely destroyed on the S. by the subsequent formation of two large rings, some 10 or 12 miles in diameter, the more easterly of which has, in its turn, been partially wrecked on the N. by a smaller object of the same class.  There is also a ring-plain N.E. of Clairaut, which has very clearly modified the shape of the border on this side.  Two craters on the floor of Clairaut are easy objects.

BACON.—­A very fine ring-plain, 40 miles in diameter, S.W. of Clairaut.  At one peak on the E. the terraced wall rises to nearly 14,000 feet above the interior.  It is broken on the S. by three or four craters.  On the W. there is an irregular inconspicuous enclosure, whose contiguity has apparently modified the shape of the border.  There are two large rings on the N. (the more easterly having a central peak), and a third on the E. The floor appears to be devoid of prominent detail.

CUVIER.—­A walled-plain, about 50 miles in diameter, on the S.E. of Clairaut.  The border on the E. rises to 12,000 feet; and on the N.W. is much broken by depressions.  Neison has seen a mound, with a minute crater W. of it, on the otherwise undisturbed interior.

JACOBI.—­A ring-plain S. of Cuvier, about 40 miles in diameter, with walls much broken on the N. and S., but rising on the E. to nearly 10,000 feet.  There is a group of craters (nearly central) on the floor.  The region S. of this formation abounds in large unnamed objects.

LILIUS.—­An irregular ring-plain, 39 miles in diameter, with a rampart on the E. nearly 10,000 feet above the floor.  A smaller ring between it and Jacobi has considerably inflected the wall towards the interior.  It has a conspicuous central mountain.

ZACH.—­A massive formation, 46 miles in diameter, on the S. of Lilius, with prominently terraced walls, rising on the E. to 13,000 feet above the interior.  A small ring-plain, whose wall stands 6000 feet above the floor, is associated with the N. border.  Two other rings, on the S.W. and N.E. respectively, have craters on their ramparts and central hills.

PENTLAND.—­A fine conspicuous formation under a low sun, even in a region abounding in such objects.  It is about 50 miles in diameter, with a border exceeding in places 10,000 feet in height above the floor, which includes an especially fine central mountain.

KINAU.—­One of the group of remarkable ring-plains extending in a N.W. direction from Pentland.

SIMPELIUS.—­Another grand circumvallation, almost as large as Pentland, but unfortunately much foreshortened.  One of its peaks on the E. rises to a height of more than 12,000 feet above the floor, on which there is a small central mountain.  Between Simpelius and Pentland are several ring-plains, most of which appear to have been squeezed and deformed into abnormal shapes.