D 285 = Mel 101 is located on the top right edge of IC 2602 in this image by Humayun (Octane).
http://members.optusnet.com.au/mrozy..._Pleiades.html
Dunlop discovered "A cluster of extremely small stars, resembling a faint nebula, about 6' diameter; round figure."
John Herschel failed to include both Lacaille's IC 2602 and Dunlop's Mel 101 in his catalogue.