A short time ago I described a new foraminiferal genus from the Tertiary of Borneo 1). I gave this genus the name of Heterospira. Mr. P. H. Oehser of Washington drew my attention to the fact that E. Koken as early as 1896²) had used the name Heterospira for a genus of triassic gastropoda from Hallstatt. Therefore according to the international rules of zoölogical nomenclature, the name Heterospira for a foraminiferal genus being a homonym has to be rejected.