It is also to be noted that various prosodical liberties, due originally to the extreme antiquity of the hexameter, and long reformed and repressed by the culture of poets, were apt to be revived in later ages, by writers who slavishly copied the most antique examples of the art of verse. See Wilhelm Christ, _Metrik der Griechen und Romer_, 2te Aufl. (1879). HEXAPLA (Gr. for "sixfold"), the term for an edition of the Bible in six versions, and especially the edition of the Old Testament compiled by Origen, which placed side by side (1) Hebrew, (2) Hebrew in Greek character, (3) Aquila, (4) Symmachus, (5) Septuagint, (6) Theodotion. See BIBLE: _Old Testament, Texts and Versions_. HEXAPODA (Gr. [Greek: hex], six, and [Greek: pous], foot), a term used in systematic zoology for that class of the ARTHROPODA, popularly known as insects. Linnaeus in his _Systema naturae_ (1735) grouped under the class Insecta all segmented animals with firm exoskeleton and jointed limbs--that is to say, the insects, centipedes, millipedes, crustaceans, spiders, scorpions and their allies. This assemblage is now generally regarded as a great division (phylum or sub-phylum) of the animal kingdom and known by K. T. E. von Siebold's (1848) name of Arthropoda. For the class of the true insects included in this phylum, Linnaeus's old term Insecta, first used in a restricted sense by M. J. Brisson (1756), is still adopted by many zoologists, while others prefer the name Hexapoda, first used systematically in its modern sense by P. A. Latreille in 1825 (_Familles naturelles du regne animal_), since it has the advantage of expressing, in a single word, an important characteristic of the group. The terms "Hexapoda" and "hexapod" had already been used by F. Willughby, J. Ray and others in the late 17th century to include the active larvae of beetles, as well as bugs, lice, fleas and other insects with undeveloped wings. _Characters._