Notes: Translated in Journal of the Bombay Natural History Society 5:388-397. See Forel (1890h).
Notes: English translation of Forel (1890c).
Notes: Translated in Annu. Rep. Smithson. Inst. 1894:479-505 (see Forel, 1896f) and in Int. J. Microsc. Nat. Sci. 16:347-381 (Forel, 1897e).