1900 112 p., 9 figs, 10 (7 folded, some partly col.) lithographed pls, roy. 4to, disbound (no covers). Published in: Denkschriften der Mathematisch-Naturwissenschaftlichen Classe der Kaiserlichen Akademie der Wissenschaften.
1938 64 p., 8 figs, 1 plate, roy. 4to, paperbound (printed covers). Back cover wrinkled and with tear. Published in: Transactions Zoological Society London.
1920 138, [1] p., num. laid on photographs & figs, small 4to, paperbound. Library stamps.