I didn't get a complete list, but here's a list of some of quantities for each Mob count so you can tell which instance you are getting prior to zoning in for Hunter.
Miragul's Menagerie Theme (Everfrost)
60 = Hushed Banquet
58 = Maw of the Menagerie
56 = Forgotten Wastes
51 = Heart of the Menagerie
51 = Spider Den
50 = Silent Gallery
Frosted Halls
Grand Library
Morbid Laboratory
Theater of Imprisoned Horrors