0. Introduction 1. Yunga phonology 2. Relationships of Yunga to other languages 3. The relationship of Yunga to Mayan 3.1. Phonology 3.2. Phonological correspondences 3.2.1. Grammatical considerations 3.2.2. Overall rules 3.2.3. Cognate sets 3.2.3.1. Consonant correspondences 3.2.3.2. Vowel correspondences 3.2.4. Yunga lexical lists 3.3. Grammatical correspondences 3.3.1. Nouns 3.3.2. Verbs 3.4. Conclusions 4. The relationship of Uru-Chipaya, Yunga and Proto-Mayan