Ancilla to the Pre-Socratic Philosophers, by Kathleen Freeman, [1948], at sacred-texts.com

56. SÎMUS OF POSEIDÔNIA; MYÔNIDES AND EUPHRANÔR

Sîmus of Poseidônia: fourth century.

Myônides and Euphranôr.

Pythagoreans. No writings are known. Simus was accused of publishing certain Pythagorean discoveries as his own.