CRUGER.—­A regular ring-plain E. of Fontana, 30 miles in diameter, with a dark floor, without detail, and comparatively low bright walls.  There is a smaller but very conspicuous ring-plain (Cruger a) on the W. of it, to which runs a branch of the great Sirsalis cleft.

EICHSTADT.—­A ring-plain, 32 miles in diameter, near the E. limb, S. of Rocca.  It is the largest and most southerly of three nearly circular enclosures, without central mountains or any other details of interest.  On the W. lies a great walled-plain with a very irregular border, containing several ring-plains and craters, and a crater-rill.  Schmidt has named this formation DARWIN.

BYRGIUS.—­A very irregular enclosure, about 40 miles in diameter, between Cavendish and the E. limb, with a lofty and discontinuous border, rising at one point on the E. to a height of 7000 feet above the floor.  There are wide openings both in the N. and S. wall, and some ridges within.  The border is broken on the E. by a crater, and on the W. by the well-known crater Byrgius A, from which a number of bright streaks radiate, mostly towards the E. One on the W. extends to Cavendish, and another to Mersenius, traversing the ring-plain Cavendish C. North-east of Byrgius there is a mountain arm which includes a peak 13,000 feet in height.

PIAZZI.—­A walled-plain, about 90 miles in length, some distance S.E. of Vieta, with a complex broken border, including several depressions on the N.W., rising to about 7000 feet above a rather dark interior, on which there is a prominent central mountain.

LAGRANGE.—­A larger but similar formation, 100 miles in diameter, associated with the last on the N.E., with a complex terraced border, including peaks of 9000 feet, a bright crater on the W., and a ring-plain on the N.W.  The inner slope of the E. wall is a fine object at sunrise, when libration is favourable.  The floor is dark and devoid of detail.

BOUVARD.—­A great irregular enclosure, which appears to be still larger than Lagrange, S.E. of Piazzi, and close to the limb.  It is bounded by a very lofty rampart, rising at a peak on the W. to 10,000 feet.  It has a fine central mountain.

INGHIRAMI.—­A very remarkable ring-plain, 60 miles in diameter, E. of Schickard, with a bright, broad, and nearly continuous border, terraced within, and intersected on the N.E. by narrow valleys, one of which is prolonged over the floor and extends to the central mountain.  There are two curious dark spots on the N. side of the interior.  Beyond the foot of the glacis on the S. a distinct cleft runs from a dusky spot to a group of small craters E. of Wargentin.  There is a fine regular ring-plain with a small central mount W. of Inghirami.

PINGRE.—­A ring-plain, about 18 miles in diameter, between Phocylides and the limb.

HAUSEN.—­A ring-plain, close to the limb, N. of Bailly, which, but for its position, would be a fine object.  It is, however, never sufficiently well placed for observation.