Tycho. The largest and best known system on the visible surface.
Zuchius. A remarkable ray-system, but one which is only well seen when
libration is favourable.
Bailly. N. of the centre of this great enclosure are two very distinct
radiating streaks.
Schickard. Four conspicuous light spots, probably craters, on the S.E.
Byrgius A. A brilliant ray-centre, most of the rays trending eastward
from a nimbus.
Hainzel. There are several bright spots E. of this formation.
Mersenius. Two or three light-rays originate from a point on the W.
rampart.
Mersenius C. A light-surrounded crater with short rays.
Grimaldi. There are three bright spots on the W. wall.
Damoiseau. A light-surrounded crater W. of Damoiseau, E. long. 58 deg.,
S. lat. 6 deg.
Flamsteed C. A light-surrounded crater on a dark surface.
Lubieniezky A. Crater with halo on a dark surface.
Lubieniezky F. Crater with halo on a dark surface.
Lubieniezky G. Crater with halo on a dark surface.
Birt _a_. A light-surrounded crater.
Landsberg. E. of Landsberg, four light-surrounded craters, forming
with Landsberg A (in the Second Quadrant) an interesting group.
Lohrmann A. A light-surrounded crater, with a light area a few miles N.
of it. S. lat. 1 deg., E. long. 61 deg.
Euclides. Has a conspicuous nimbus with traces of rays, a typical
example.
Guerike. There is a crater, with nimbus, W. of this, in E. long. 12 deg.,
S. lat. 11 deg. 5 min.
Parry. A very brilliant light-spot in the S. wall.
Parry A. Surrounded by a bright nimbus.
Alpetragius B. A conspicuous light-surrounded crater, one of the most
remarkable on the moon.
Alpetragius _d_ (E. long. 11 deg., S. lat. 13 deg. 8 min.). A bright
spot, seen by Madler as a crater, but which, as Schmidt found in 1868, no
longer answers to this description.
Mosting C. A light-surrounded crater.
Lalande. Has a large nimbus and distinct rays.
Hell. A large ill-defined spot in E. long. 4 deg., S. lat. 33 deg. This
is most probably the site of the white cloud seen by Cassini.
Mercator. There is a brilliant crater and light area under E. wall.