Meanings of chuckle inly in English

But Levy rubbed his hands, and chuckled inly; and Egerton hung his head, and moved restlessly on his seat.

My father evidently thought this an exquisite piece of banter, for by the corner of his mouth I saw that he chuckled inly.

Next to Nicot, an old woman and a young virgin were muttering in earnest whispers, and the atheist painter chuckled inly to overhear their discourse.