Definition of "Selenite"

My first impression was of some clumsy quadruped with lowered head. Then I perceived it was the slender pinched body and short and extremely attenuated bandy legs of a Selenite, with his head depressed between his shoulders.

1901, Herbert George Wells, “The Selenite's Face”, in The First Men in the Moon

"Come Diana [a dog]," said he; "come, my girl! thou whose destiny will be marked in the cynegetic annals; […] thou who art rushing into interplanetary space, and wilt perhaps be the Eve of all Selenite dogs! come, Diana, come here."

1873, Jules Verne, “Round the Moon: A Sequel to From the Earth to the Moon. Chapter III. Their Place of Shelter.”, in Louis Mercier [i.e., Lewis Page Mercier], Eleanor E. King, transl., From the Earth to the Moon, Direct in Ninety-seven Hours and Twenty Minutes: And a Trip Round It. […], New York, N.Y.: Scribner, Armstrong & Company, published 1874, page 170