Carausius, AE antoninianus, London mint. 

IMP CARAVSIVS PF AVG, radiate, draped and cuirassed bust right.
LEG II AVG, capricorn leaping left. 
Mintmark ML.

RIC V-2, London 58; Sear 13608; Ashmolean HCR24183.

Image courtesy of the Ashmolean Museum.