Chalcedony tauroctony gem from Paris

Fragment of a yellowish chalcedony (H. 0.02 Br. 0.016). Formerly in the Coll. Millingen; from 1806 at Paris, Cabinet des Médailles.Chabouillet, Cat. Cam., 263 No. 2031; Lajard, Intr., Pl. CII, 8; Duruy, Hist. Rom., VI, 146 fig.; MMM II 448 No. 2 and fig. 394. See fig. 657 kindly sent by Dr. Jean Babelon.Mithras as a bullkiller in a vaulted grotto. The raven behind his flying cloak; the snake, the scorpion and the dog. Only one torchbearer is represented; he is not cross-legged (r). He holds a torch downwards in each hand (Cautopates). Next to Mithras a crescent and the head of Sol in radiate crown.