Manuscripts of the New Testament frequently contain, in addition to the text, supplementary information such as excerpts from the Fathers, chapter lists, quotation lists, introductions to sections, for example, the Pauline letters, and to individual books. The Euthalian apparatus is the name given to one such collection of helps to the reader. Unfortunately, the relationship of the various parts, the identity of the author, the time of the writing, and the provenance remain uncertain. This work collects, summarizes, and analyzes the sometimes disparate published scholarship on the apparatus through 1970. The bibliography updates the original bibliography through 2007 and includes newly identified, earlier bibliographic references.