Abstract: In this paper, some comments on the newly-discovered “nanometer-scale ultramicrofossils” (Spirisosphaerospora pacifica and Miniactinomyces chinensis) in pelagic manganese nodules from the East Pacific Ocean are made. Because the morphology of these “fossils” is uncertain, at present the evidence for a microbial origin and their biological affinites can not be regarded as conclusive. Much further work, therefore, is needed to clarify the true nature of these problematic microorganisms.