Correspondence with Connie McTurk regarding collecting animals in British Guiana for the Zoological Society of London
Letter from Robert McLachlan of The Entomological Society, to Philip Lutley Sclater regarding an elephant trunk that was suffering from caries
Letter from Robert McKim to Philip Lutley Sclater regarding his subscription to the Zoological Society of London
Correspondence between Captain C McKenzie and George Soper Cansdale regarding two lion cubs sent to the Zoological Society of London from Nigeria. One was named The Emir of Katagum and the other McKenzie of Katagum
Correspondence between James McInnis and Geoffrey Marr Vevers regarding a request of small Limulus for the Zoological Society of London from the Marine Biological Laboratory in Massachusetts
Letters from Josiah McGregor to Philip Lutley Sclater regarding a Pilcomayo expedition