MR. DENDY'S observation of the extrusion of incompletely developed eggs in Peripatus is not, as he appears to think, entirely new. Captain Hutton was the first to observe it, in P. novae-zealandiae, and I confirmed his observation for the same species in my monograph of the genus. No one knows whether the eggs so extruded undergo complete development. I am inclined to think that the process, which has only been observed in animals in captivity, is an abnormal one, and is caused by the alteration in the conditions of the animal's life. We know that the New Zealand species does bring forth fully-developed young.