The identification of the morphemes and morpheme classes of a language frequently presents difficulties. Some of these involve problems in morphemic theory itself. This is true of two problems in Ocaina, one concerning morphemic segmentation and fusion, and the other concerning morphemic compounding as it distorts morpheme distribution classes. The data are presented and interpreted in §§1–2. The theoretical implications are summarized in §3, where it is pointed out that the interlocking of the lexical and grammatical hierarchies must be distinguished from effects of the interlocking of the lexical and phonological hierarchies.