The collection at the Library of Alexandria contained nearly 500,000
papyrus scrolls, which were grouped together by subject matter and stored in bins. Each bin carried a label with painted tablets hung above the stored papyri.
Pinakes was named after these tablets and are a set of index lists. The bins gave bibliographical information for every roll. A typical entry started with a title and also provided the author's name, birthplace, father's name, any teachers trained under, and educational background. It contained a brief biography of the author and a list of the author's publications. The entry had the first line of the work, a summary of its contents, the name of the author, and information about the origin of the roll, as well as any doubts about the genuineness of the ascription. Callimachus' system divided works into six
genres of poetry and five sections of prose: rhetoric, law, epic, tragedy, comedy, lyric poetry, history, medicine, mathematics, natural science, and miscellanies. Each category was alphabetized by author. Callimachus composed two other works that were referred as
pinakes and were probably somewhat similar in format to the
Pinakes (of which they "may or may not be subsections"), but were concerned with individual topics. These are listed by the
Suda as:
A Chronological Pinax and Description of Didaskaloi from the Beginning and
Pinax of the Vocabulary and Treatises of Democritus. ==Later bibliographic
pinakes==