Abstract
Detailed studies of the comparative anatomic relations and development, phylogenetic and ontogenetic, of the cerebellum in mammals and submammals have thrown new light on the functional connections and relations of its fundamental divisions. They have made necessary a modification of the morphologic interpretation of the organ and some revision of terminology. This reinterpretation has been made gradually in a series of papers, which have been chiefly descriptive. Changes in terminology have been made grudgingly, with a desire to avoid encumbering further an already troublesome nomenclature. As the studies have progressed, some new terms have seemed necessary, and modifications of old terms have also been introduced from time to time. These changes are scattered through a number of papers, for which reason it appears desirable to gather them together into one article, to point out briefly the reasons for their use and to discard some that have been used more or

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