This is a supporting image of Hercules and Pholus. This is the type of vase that the illustrating was on. A hydria vase is the most common vase, used usually for water. Calpisi are types of hydria vases, just rounded more to fit illustrations.
Image Credit: https://www.studyblue.com/notes/note/n/vase-shapes/deck/10122846
Reuse License: Public Domain