LACAILLE.—­An oblong enclosure situated on the N. side of Blanchinus, and apparently about 30 miles in greatest diameter.  The border is to a great extent linear and continuous on the N., but elsewhere abounds in depressions.  Two large inosculating ring-plains are associated with the N.E. wall.

BLANCHINUS.—­A large walled-plain on the W. of Purbach and abutting on the S. side of Lacaille.  It much resembles Purbach in shape, but has lower walls.  Schmidt shows a crater on the N. side of the floor, which I have seen, and a number of parallel ridges which have not been noted, probably because they are only visible under very oblique light.

GEBER.—­A bright ring-plain, 25 miles in diameter, S. of Almanon, with a regular border, rising to a height on the W. of nearly 9000 feet above the floor.  There is a small crater on the crest of the S. wall, and another on the N. A ring-plain about 8 miles in diameter adjoins the formation on the N.E.  According to Neison, there is a feeble central hill, which, however, is not shown by Schmidt.

SACROBOSCO.—­This is one of those extremely abnormal formations which are almost peculiar to certain regions in the fourth quadrant.  It is about 50 miles in greatest diameter, and is enclosed by a rampart of unequal height, rising on the E. to 12,000 feet above the floor, but sinking in places to a very moderate altitude.  On the N. its contour is, if possible, rendered still more irregular by the intrusion of a smaller ring-plain.  On the N.E. side of the floor stands a very bright little crater and two others on the S. of the centre, each with central mountains.

FERMAT.—­An irregular ring-plain 25 miles in diameter on the W. of Sacrobosco.  Its partially terraced wall is broken on the N. by a gap which communicates with the interior of a smaller formation.  There are some low hills on the floor, which is depressed 6000 feet below the crest of the border.

AZOPHI.—­A prominent ring-plain, 30 miles in diameter, E.N.E. of Sacrobosco, its lofty barrier towering nearly 11,000 feet above a somewhat dusky interior, which includes some light spots.  A massive curved mountain arm runs from the S. side of this formation to a small ring-plain W. of Playfair.

ABENEZRA.—­When observed near the morning terminator, this noteworthy ring-plain, 27 miles in diameter, seems to be divided into two by a curved ridge which traverses the formation from N. to S., and extends beyond its limits.  The irregular border rises on the W. to a height of more than 14,000 feet above the deeply-sunken floor, which includes several craters, hills, and ridges.

APIANUS.—­A magnificent ring-plain, 38 miles in diameter, N.W. of Aliacensis, with lofty terraced walls, rising on the N.E. to about 9000 feet above the interior, and crowned on the W. by three large conspicuous craters.  The border is broken on the N. by a smaller depression and a large ring with low walls.  The dark-grey floor appears to be devoid of conspicuous detail.