Rock-crystal tauroctony gem from Paris

Gem in "rock-crystal" (H. 0.021 Br. 0.026). Paris, Cabinet des Médailles. I am obliged to Dr. Jean Babelon who kindly sent me a photograph.Chabouillet, Cat. Cam., 246 No. 2302; Lajard, Intr., Pl. CII, 2; E. Babelon, Gravure, 174 fig. 131; MMM II 447 No. 1 and fig. 393 (after Lajard); Eisler, Weltenmantel I, 63 n. 1 and fig. 9. See fig. 656.Mithras as a bullkiller. The god has a crown of five rays; three stars on his flying cloak. The dog, the snake, the scorpion. The raven and the two torchbearers are not represented.