one-vented

Updated: May 27, 2025

First among the mammals we find the aplacentals, or those which bring forth immature young, which are grouped into two divisions, i.e., the monotremes, or one-vented animals, in which group belong the duck-bills, spiny ant-eaters, etc.; and the marsupials, or pouched animals, in which group belong the kangaroo, opossum, etc.

William Walker Atkinson - A Series of Lessons in Gnani Yoga