Ptolemaeus.
12. Of Ascalon, taught at Rome.
Works
His works were,
προσῳδία Ὁμηρική, περὶ Ἑλληνισμοῦ ἤτοι ὐρθοεπίας βιβλία ιέ, περὶ μέτρων, περὶ τῆς ἐν Ὀδυσσείᾳ Ἀριστάρχου διορθώσεως, περὶ διαφορᾶς λέξεων, and other grammatical works.
The most important of these works was that
περὶ διαφορᾶς λέξεων, which formed the foundation of the similar work of Ammonius.
Editions
It is still extant, and it is printed in the Bibliotheca Graeca of Fabricius (vol. vi. pp. 156-163, comp. vol. i. p. 52).