μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs
P. κοχλίας, ὁ (Aristotle).
snail shell: V. στράβηλος, ὁ or ἡ (Sophocles, Fragment).