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venous drainage of the uterus throughout most ofpregnancy (Douglas, Thomas, Carr, Cullen & Morris, 1959) and, although many are subsequently destroyed, probably by some lytic action of the blood, considerable numbers reach the maternal lungs (Attwood & Park, 1961). The functional significance of this phenomenon is obscure, but a number of suggestions have been put forward : that it is merely a physiological desquamation, that the trophoblast cells may have an endocrine function, or an immunological function, or that they may liberate thrombokinase and affect blood coagulation during pregnancy. The allied phenomenon of villous deportation is regarded as essentially accidental and probably of little significance (Hamilton & Boyd, 1966). One of the main difficulties of regarding trophoblast deportation as a phenomenon of biological importance was that it appeared to be restricted to human pregnancy. There have been a number of such assertions in the literature. In view of this we feel it important to point out that this also occurs during normal pregnancy in the chinchilla {Chinchilla laniger). There are a few isolated reports, confined to observations on small numbers of animals (Helmboldt, Jungherr & Caparo, 1958; Hellweg, 1959, cites a personal communication; Burtscher, 1963; Benirschke, 1964, in a discussion following

DEPORTATION OF TROPHOBLAST IN THE CHINCHILLA