The difference in the skull of Hystrix and acanthion lies in the intermaxillaries and the grinders, as follows:- Hystrix-Inter-max.
"Natural History of the Mammalia of India and Ceylon"
Robert A. Sterndale
This animal was described by Gray as acanthion Hodgsonii, the lesser Indian porcupine.
"Natural History of the Mammalia of India and Ceylon"
Robert A. Sterndale