Two stone heads of luohan. Song dynasty or later

Two stone heads of luohan. Song dynasty or later

Both heads of the Indian type, with numerous wrinkles to the face, large ears and an open mouth, a) of dark grey stone with remains of lime? and b) with a strange ornament to the bald head, and heavy lime incrustations. (2)
Height a) 10 cm; b) 12.5 cm