264 KEVOKT — 186G. 



IV A? ^^ betAvecn them, situated on the JST.W. border of the plain in Avhich 

 the group IV A^ and surrounding objects are situated. 



+62. A minute craterlet at the S.W. end of IV A^^^, estimated l"-0, 



mag. 0-06. 

 +63, A minute craterlet N.E. of IVA^^^, estimated l"-0, mag. 0-06, 

 +64. A minute craterlet IST.E. of IV A^ ^3, estimated l"-0, mag. 0-06, 

 These minute craterlets form a short crater-row at the closed extremity of 

 the valley IV A^^^- They are inserted on the authority of Lohrmaun, who 

 mentions them in his text, " Topographic der Sichtbaren Mondoberflache," 

 Erste Abtheilung, auf Section I. p. 49, A. I have not yet seen them. Es- 

 timated length of crater-row 5"-0. 



*65. A crater-form depression S.E. of Halley. 48, Sec. I. of Lohrmann. 

 Length S.S.W.-N.N.E. 16"-64, breadth W.N.W.-E.S.E. 7"-61. 

 66. A depression in which the mountain IV A^^^ is situated. 7"*6], 

 mag. 0'46. Not shown by Lohrmann. 

 **67. A cratcr-riU on the summit of the N.E. wall of Albategnius, dis- 

 covered as such by Schmidt, on February 3rd, 1865. It is 'No. 

 355 in his ' Catalogue of EiUs,' and extends from the west edge of 

 IVA^33 to IVA^36^ ipjjgth W.N.W.-E.S.E. 21"-40. 

 This crater-rill forms the N.E. boundary of the group of craters in the 

 jiorth angle of Albategnius, and would appear to be the most recent in- 

 stance of volcanic action in this locality, except tlic fault from Tycho. Itg 

 extreme luhitencss, as compared -with the surface in its neighbourhood, the 

 steepness of its S.S.W. and N.N.E. sides, and particularly its cutting through 

 the crater IV A^ ^ ' , testify to the comparative recent epoch of its formation. 

 See IV A^^^. It is a fine object at sunrise. 



68. A craterlet on IV A^^^ east of IV A^*'. 2"-61, mag. 0-15, 



69. A crater-form depression on the W.S.W. slope of the line of cliffs 



which cross the N.E. angle of Albategnius in a line with those 

 crossing Hipparchus ; it is situated just S.S.E. of IV A^^^. 7"-13, 

 mag. 0'42. It is shown by Lohrmaun. 



70. A crater-form depression on the E.N.E. side of the same line of cliffs 



7"'61, mag. 0"50. It is shown by Lohrmann. 

 J71. A formation, somewhat of the character of a trapezium, on the line 

 of cliffs extending from IV A? ^^ ^q jy ^? 29_ j^. ]^^^ ^ bright bor- 

 der with a dark interior. Length, N.W. to S.E., 7"-61; breadth, 

 S.W. to N.E., 4"-76. 

 t72. A depression onlVA^^"^, apparently a crater. Elliptical, longer 

 axis, east to west 8"-56 ; shorter, north to south 5"-71, mag. 0-44. 

 This depression was seen, 1866, Sept. 19'' 8'' 0", G.M.T., with the Royal 

 Society's 45-inch achromatic, power 230, as a very imperfect crater; the 

 north rim appeared nearly perfect, but the south rim, if it previously existed, 

 has been broken away by the convulsion that produced the deep hoUow 

 iy^?97_ jt jg jjQ^ shown by Lohrmann. 



73. A small depression (not craterlet) in the elevated angle between 

 IV A? 09 and IV? •'^*'. 2"-38, mag. 0-16. 



74. A craterlet on the crater-rill IV A^^^^ j^gt ggg^ ^f IVA^*''' and 



IV A? 3fi^ 4"-28, mag. 0-26. Lohrmann gives it larger than IV A^ ^''. 



