ZAGUT.—­The most easterly of a group of closely associated irregular walled-plains, of which Lindenau and Rabbi Levi are the other members, all evidently deformed and modified in shape by their proximity.  It is about 45 miles in diameter, and is enclosed by a wall which on the S.W. attains a height of about 9500 feet, and is much broken on the N. by a number of depressions.  A large ring-plain, some 20 miles in diameter, occupies a considerable portion of the W. side of the interior; E. of which, and nearly central, there is a large bright crater, but apparently no other conspicuous details.  On the S.E. side of Zagut lies an elliptical ring-plain, about 28 miles in diameter, named by Schmidt CELSIUS.  The border of this is open on the N., the gap being occupied by a large crater, whose S. wall is wanting, so that the interiors of both formations are in communication.

LINDENAU.—­This formation, about 35 miles in diameter, is bounded on the W. by a regular unbroken wall nearly 8600 feet in height; but which on the E. and N.E. is far loftier and more complex, rising to about 12,000 feet above the floor, consisting of four or more distinct ramparts, separated by deep valleys, and extending towards Rabbi Levi.  Neison points out that under a high light Lindenau appears to have a bright uniform single wall.  There is a small central mountain and some minor inequalities in the interior.

RABBI LEVI.—­A larger but less obvious formation than either of its neighbours, Zagut and Lindenau, abutting on the S. side of them.  It is about 55 miles in diameter, and is enclosed by a border somewhat difficult to trace in its entirety, except under oblique light.  There are some large craters within it, of which one on the N. side of the floor is especially prominent.

NICOLAI.—­A tolerably regular ring-plain, 18 miles in diameter, S. of Riccius, with a border, rising more than 6000 feet above a level floor, on the N. side of which Schmidt shows a minute crater.  The bright plain surrounding this formation abounds in small craters; and on the W. is a number of curious enclosures, many of them overlapping.

VLACQ.—­A member of a magnificent group of closely associated formations situated on the greatly disturbed area between W. long. 30 deg. and 45 deg. and S. lat. 50 deg. and 60 deg.  It is 57 miles in diameter, and is enclosed by terraced walls, rising on the W. about 8000 feet, and on the E. more than 10,000 feet above the floor.  They are broken on the S. by a fine crater.  In addition to a conspicuous central peak, there are several small craters, and low short ridges in the interior.

HOMMEL.—­Adjoins Vlacq on the S. It is a somewhat larger and a far more irregular formation.  On every side except the W., where the border is unbroken, and descends with a gentle slope to the dark interior; ring-plains and smaller depressions encroach on its outline, perhaps the most remarkable being Hommel a on the N., which has an especially brilliant wall, that includes a conspicuous central mountain, a large crater, and other details.  The best phase for observing Hommel and its surroundings is when the W. wall is just within the evening terminator.