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Its walls, though of only moderate altitude, are distinctly terraced. HAGECIUS. The most westerly member of the Vlacq group of formations. It is situated on the S.W. of Rosenberger, and is about 50 miles in diameter. The rampart on the E. is continuous and of the normal type, but on the opposite side is broken by a number of smaller rings. WEST LONGITUDE 40 deg. TO 20 deg.
VLACQ. A member of a magnificent group of closely associated formations situated on the greatly disturbed area between W. long. 30 deg. and 45 deg. and S. lat. 50 deg. and 60 deg. It is 57 miles in diameter, and is enclosed by terraced walls, rising on the W. about 8000 feet, and on the E. more than 10,000 feet above the floor. They are broken on the S. by a fine crater.
In addition to a conspicuous central peak, there are several small craters, and low short ridges in the interior. HOMMEL. Adjoins Vlacq on the S. It is a somewhat larger and a far more irregular formation.
The best phase for observing Hommel and its surroundings is when the W. wall is just within the evening terminator. PITISCUS. The most regular of the Vlacq group. It is 52 miles in diameter, and is surrounded by an apparently continuous rampart, except on the E., where there is a crater, and on the S.W., where it abuts on Hommel h.
NEARCH. A ring-plain, about 35 miles in diameter, on the S.W. of Hommel, forming part of the Vlacq group. TANNERUS. A ring-plain, about 19 miles in diameter, between Mutus and Bacon. It has a central mountain. MUTUS. A fine but foreshortened walled plain, 51 miles in diameter. There are two ring-plains of about equal size on the floor, one on the N., and the other on the S. side.
BIELA. A considerable ring-plain, about 55 miles in diameter, S.W. of Janssen, with a wall broken on the N.W., S., and E. by rings and large enclosures. There is a central mountain, but apparently no other details on the floor. ROSENBERGER. This formation, about 50 miles in diameter, is one of the remarkable group of large rings to which Vlacq, Hommel, Pitiscus, &c., belong.
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