Phocylides est un cratère de 114 Km et profond de 2800 m situé près du limbe Sud-ouest de la lune. Il recouvre le mur Sud du cratère Nasmyth (77 Km) sur son versant Nord-ouest. Le mur externe de Phocylides est érodé, particulièrement le long du bord occidental. Le bord nordique du mur est entaillé et irrégulier, avec une élévation du mur joignant Wargentin. Le cratère Phocylides F (23 Km) se trouve positionné sur le mur méridional. Le plancher de Phocylides est  inondé et  relativement  lisse, avec quelques petits craterlets et aucune crête centrale. L'impact le plus notable sur le plancher est un cratère près du mur Nord-est. A noter des taches blanches.

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Phocylides is a lunar crater located near the southwest rim of the Moon. It overlays the south rim of Nasmyth crater to the north. To the northwest is the unusual plateau formation of Wargentin crater. Eastward is the merged Schiller crater formation, and in the southwest lies the Pingré crater.
The outer wall of Phocylides is worn and eroded, especially along the western edge. The northern edge of the rim is notched and irregular, with a rise of ground joining the south rim of Wargentin. The crater Phocylides F lies across the southern rim. The floor of Phocylides is flooded and relatively smooth, with a few small craterlets and no central peak. The most notable impact on the floor is a crater near the northeast rim.