MACCLURE.—­One of a curious group of formations situated in the Mare Foecunditatis some distance S.W. of Goclenius.  It is a bright ring-plain, about 15 miles in diameter, with a narrow gap in the N.E. wall and a small central hill.  A prominent ridge runs up to the N. border; and on the S.W. a rill-valley may be traced, extending S. to a bright deep little crater W. of Cook.

CROZIER.—­A conspicuous ring-plain a few miles N.N.W. of MacClure, and of about the same size.  It has a faint central hill.  Neison refers to two long straight streaks extending from Crozier towards Messier.

BELLOT.—­A brilliant little ring-plain N.E. of Crozier.

COOK.—­A ring-plain, about 25 miles in diameter, on the E. side of the Mare Foecunditatis in S. lat. 17 deg., with low and (except on the S.E.) very narrow walls.  There is a small circular depression on the S. border, and a prominent crater on the W. side of the dark interior.  On the S.S.E. is the curiously shaped enclosure Cook d, with very bright broad lofty walls and a fine central mountain.  On the plain W. of Cook is a conspicuous crater-row, consisting of six or seven craters, diminishing in size in both directions from the centre.

COLOMBO.—­A fine ring-plain, about 50 miles in diameter, situated in the highlands separating the Mare Foecunditatis and the Mare Nectaris.  The wall, rising at one place to a height of 8000 feet above the floor, is very complicated and irregular, being traversed within by many terraces, and almost everywhere by cross-valleys.  Its shape is greatly distorted by the large ring-plain a, which abuts on its N.E. flank.  It loses its individuality altogether on the S., its place being occupied by two large depressions, and lofty mountains trending towards the S.E.  In the centre there are several distinct bright elevations.

MAGELHAENS.—­The more northerly and the larger of a pair of ring-plains between Colombo and Goclenius, with a bright and somewhat irregular though continuous border.  The dark interior includes a small central mountain.  Its companion on the S.W., Magelhaens a, slightly overlaps it.  This also has a central hill, and a crater on the outer slope of its E. wall.

SANTBECH.—­A very prominent ring-plain, 46 miles in diameter, on the S.E. side of the Mare Foecunditatis, W. of Fracastorius.  The continuity of its fine lofty rampart is broken on the W., where it rises nearly 10,000 feet above the floor, by a brilliant little crater just below the crest, and by a narrow gap on the S. The wall on the E. towers to a height of 15,000 feet above the interior.  On its broad outer slope, near the summit, there is a fine crater, and S. of this running obliquely down the slope a distinct valley.  On the N.E., where the glacis runs down to the level of the surrounding plain, there is a large crateriform object with a broken N. border, and a small crater opposite the opening.  A long coarse valley runs from this latter object in a N.E. direction to the region W. of Bohnenberger.  Santbech contains a prominent central peak.