Astomi people

...It's a difference in how you look at a mouth. According to Pliny the Elder, the Astmians, who had no mouths and were covered in hair, lived near the source of the Ganges River at the eastern end of India, and they smelled the roots and flowers without eating or drinking (Natural History, Book 7), but this is of course incorrect. In the Book of Revelation, there is a story about a dragon that fought an angel, was defeated, and fell to the earth, and this dragon opened its mouth and became the entrance to hell.

*Some of the terminology that refers to the Astomi people is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…口を見る眺め方の違いである。　大プリニウスによれば，インドの東端ガンジス川の水源近くに，口がなく全身毛で覆われたアストミ人が住み，飲食することなく木の根や花のにおいをかいでいた(《博物誌》第7巻)というが無論誤りである。《ヨハネの黙示録》に天使と戦って敗れ地に落ちたドラゴンの話があるが，このドラゴンが口を開いて地獄の入口となった。…

※「アストミ人」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報