Mailer introduced the terms Polymyodi and Tracheophones, Huxley that of Oligomyodi; Mailer himself had, moreover, pointed out the more important characters of the mode of insertion, but it was Garrod who invented the corresponding terms of Acro- and Mesomyodi (= Tracheophones+Oligomyodi).
Mailer's curious Les Origines de la Compagnie de Jesus (Paris, 1898), in which the author tries to establish a Mahommedan origin for many of the ideas adopted by the saint.
C. Mailer's Bavaria, both based on trigonometrical surveys.
Mailer's studies on the larval forms of Echinoderms and the discoveries of Vaughan Thompson were appreciated.