BRIEF [O.A.] Goubin, L... Author: Goubin, L... Recipient: Haeckel, Ernst Corporation: Museum d'Histoire Naturelle, Laboratoire de Malacologie Dating: 16.08.1907
BRIEF [O.A.] Genestoux, Calemard du Author: Genestoux, Calemard du Recipient: Haeckel, Ernst Dating: 27.10.????
BRIEF [O.A.] Giard, Alfred Author: Giard, Alfred Recipient: Haeckel, Ernst Corporation: Sorbonne facultè des Sciences, Laboratoire de Zoologie Maritime de Wimereux (Pas-de Calais) Dating: 02.03.1889
BRIEF [O.A.] Giard, Alfred Author: Giard, Alfred Recipient: Haeckel, Ernst Corporation: Station Zoologique de Wimereux Pas de Calais Dating: 31.08.1901