Polyphemus was one of the Cyclopes described in Homer's Odyssey.

"Cynocephalus" means "dog head" in Greek, but although this seems like a misnomer, the Yellow Baboon species does have a dog-like head and muzzle and were given this Greek name.

From Undertow:

"We are very excited to introduce to you our new limited edition 'Cynocephalus Polyphemus' mug released in collaboration with @theshrunkenmonkey, a.k.a. David O'Connell. This intricate creation was inspired by the unpublished 'Chapter Eight: Rattle and Bones, Games of Chance and Valor,' chronicling a tale where these rare one-eyed baboon skulls were made as an offering to the Chief of Peace for safe passage aboard the Undertow. ⁠ ⁠ You're invited to join us on Friday, April 29 from noon to 2 pm on the Century Grand Patio to pick up your mug, meet & greet the talented artist, and enjoy a frozen crafted cocktail in it — on us. Each mug is priced at $300, and there are only 100 available for purchase."