Colonies are suspicious for Bacillus anthracis / Bacillus cereus, if they posses a so called "Medusa head". Curl-like projections from the colonie edge.

Bacillus anthracis: non-hemolytic

Ballus cereus: hemolytic

In Greek mythology Medusa, generally described as a winged human female with living venomous snakes in place of hair.
Gazers upon her hideous face would turn to stone.

Medusa was beheaded by the hero Perseus, who thereafter used her head, which retained its ability to turn onlookers to stone, as weapen untill he gave it to the godess Athena to place on her shield.

Wikipedia

Source/Photographer: http://www.ibiblio.org/wm/paint/auth/caravaggio/medusa.jpg

Photo
MMIZ, ErasmusMC
Rotterdam