Abstract
IN A PREVIOUS REPORT we (L. F. and T. M.)(I), published observations which were made on the ovaries of Brazilian snakes: oviparous, Xenodon merremii; ovoviviparous; Crotalus terrificus, Bothrops jararaca and Bothrops alternata. In viviparous snakes we found typical corpora lutea equal in number to the fixed embryos in the uterus. These corpora lutea do not exist in oviparous snakes and are absent whenever viviparous snakes are not pregnant. We report here results of studies on functional significance of the organ and on the migration of the egg. From August 1936 to December 1937 we operated on 165 snakes in the Butantan Institute of Sao Paulo. During August very few snakes are pregnant and only after October does one find numerous cases of intra-uterine pregnancy. Eggs, the size of walnuts, are found in the ovary at the side of the more or less ripe follicles.
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