366 REPORT — 1866. 



This valley opens out into a shallow sinuous valley that crosses Hipparchus 

 just east of the line of cliflfe, and enters a mountain-gorge just east of IV A* '^; 

 the opening into the shallow valley on the plain of Hipparchus is partly 

 obstructed by some low hills. The shallow valley is provisionally shown on 

 the map, as it is not discernible on the photograph, and good drawings of 

 it are required. It is only visible just after the passage of the morning, or 

 just before the passage of the evening terminator, and is marked with a J. 



86. A small detached mountain N.W. of IV A?" 3"-33. 



87. A small depression at the foot of IV A?^^^ 3"-33, mag. 0-20. 



88. An imperfect crater between IV A? ^^ and IV A? ^6 5". 71^ mag. 0-34, 

 t89. A ridge connecting IV A? ^^^ with IV A? 5, length 7"-5. 



90. A craterlet S.E. of the mountain IV A^ ^^. It is the most southern 



of thi'ee, forming a crater-rUl, estimated at 3"*0. 



91. An elongated crater east of the mountain IV A^ ^^ between IV A^ ^^ 



and IV A^^^ estimated at 5"-0. 



92. A craterlet just south of IV A? ^, the most northern of the crater- 



riUs east of IV A^ ^^ estimated at 2"-5. 

 The above three objects form a crater-rill, estimated length 11"*0, not in 

 Schmidt's printed Catalogue ; it was discovered by the author on the 18th of 

 August, 1866. Lohrmann has /oh?- craterlets here. 



93. A craterlet N.W. of and adjoining IV A^ ^^ ; it is the south-eastern 



of a crater-riU between IV A? ^3 ^nd IV A^ ^2^ estimated at 2"-6. 



94. A craterlet between IV A^ ^1 and IV A.^ ^^, estimated at 2"-6. 



IV A^"!, IV A^ 3'^, IVA^9^ and IV A^''^ f^j.^^ ^ crater-rill, estimated 

 length ll"-5 ; not in Schmidt's printed Catalogue. It was discovered by the 

 author on the 18th of August, 1866. Lohrmann gives a mountain, 



95. A craterlet just south of IV A^ ^, estimated at 2"'5. 



This craterlet, with IV A^^", is in a line with the crater-row IV A^-*-"^ ^o 

 IV A^-'-^, and a little inclined southwardly to the line of depression III. 

 W.S.W.-E.KE. ; Webb's furrow IV A^ 20 jg ^^ ^j^^ gj^j^^ ^^^^ ^ ^^ ^^^^ 

 shown either by Lohrmann or B. & M. 



96. A valley extending from IV A? ^^ to IV A^^^ in the direction 



S.S.W.-N.N.E, It is not inserted in the map, as it has only been 

 observed once, when its outline was not ascertained. It is slightly 

 west of the line of depression and upheaval V. S.S.W.-K.N.E. 



97. A deep hollow of a very irregular form in the high land between 



Albategnius and Ptolemseus. It is situated, west to east, between 

 the mountains IV A^'^ and IV A^ ^^, and north to south between 

 the north rim of IV A^ ^^ and the high land between the east bor- 

 der of Albategnius and the S.W. border of Ptolemaeus. Its inte- 

 rior W. and N.W. slopes, which are very rugged, form the pre- 

 cipitous descents from the summits of IV A^''^, the S.E. rim of 

 IV A^ ^2, and the broken portion of IV A^ ^2; the west front of 

 IV A? 17^ which does not appear to be so rugged, forms its interior 

 east slope. It is not shown by Lohrmann. 



98. A steep point in the N.W. border of Ptolemaeus just north of 



IV A^ 3 ; it is indicated on B. &M.'s map by r/. Their measures give 



