Abstract While it will be necessary to deal in greater detail at a later stage with some of the phenomena herein described, and with their bearing upon the work of others, I shall begin with a general description of my observations. I propose to adopt some of the terms used by Miss Digby in her paper on the “Meiotic Mitoses in Osmunda,” in order to avoid confusion, and also because these observations on the Meiotic phase in Triton agree, at any rate as to some of the most important points, with hers on Osmunda. “The term thread will be used to specify the longitudinal half of an entire univalent spireme or chromosome.” “The term filament will be used to specify the entire univalent spireme, the product of the close lateral association of two threads (i. e., of two longitudinal halves of univalent spireme.” I would add, or chromosome.