ZUCHIUS.—­Is situated on the S.E. of Segner, which it slightly overlaps.  It is very similar in size and general character, and has a lofty terraced wall, rising at one place on the W. to nearly 11,000 feet above the floor.  A very fine chain of craters, well seen when the opposite border is on the morning terminator, runs round the outer W. slope of the wall.  There is a bright crater beyond this on the S.W.  Zuchius has a central peak.

BETTINUS.—­Another ring-plain of the same type and size, some distance S. of the last, with a massive border, terraced within, and rising on the W. more than 13,000 feet above the floor, on which stands a grand central mountain, whose brilliant summit is in sunlight a long time before a ray reaches any part of the deep interior.

KIRCHER.—­A ring-plain, about 45 miles in diameter, S. of Bettinus, remarkable also for its very lofty rampart, which on the S. attains the tremendous height of nearly 18,000 feet above the floor, which appears to be devoid of detail.

WILSON.—­The most southerly of the chain of five massive ring-plains, extending in an almost unbroken line from Segner and differing only very slightly in size.  It is about 40 miles in diameter, and has a somewhat irregular border, both as regards shape and height, rising at one peak on the S.W. to nearly 14,000 feet above a level interior, which apparently contains no conspicuous features.

EAST LONGITUDE 60 deg.  TO 90 deg.

GRIMALDI.—­This ranks among the largest wall-surrounded plains on the moon, and is perhaps the darkest.  It extends 148 miles from N. to S. and 129 miles from E. to W., enclosing an area of some 14,000 square miles, or nearly double that of the principality of Wales.  This vast dusky surface is bounded on the E. by a tolerably regular border, having an average height of about 4000 feet, while on the opposite side it is much broken, and in places considerably loftier, rising at one peak on the S.W. to an altitude of 9000 feet.  About midway, also, this western rampart attains a great height, as may be seen by any one who observes at sunrise the magnificent shadow of it, and its many peaks thrown across the bluish-grey interior.  On the S. the wall is broken by a large irregular depression, on the W. of which is a very curious V-shaped rill valley.  On the N.W. it is comparatively low, and in places discontinuous; and even to a greater extent than on the S.W., intersected by passes.  At the extreme N. end, a number of wide valleys cut through 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.