Abstract
The tissues of 31 platyrrhine monkeys were studied for sex markers. A typical sex chromatin body analogous to other primates, was found in the females of all animals. The size, position, frequency, number and shape of the sex chromatin mass is essentially analogous to human tissues. Embryos of 8 and 14 weeks and full term gestation were also studied. The sex chromatin was easily recognized in the female embryos of all ages.
The finding of two distinct sex chromatin masses present in cerebellar Purkinje cells of immature animals is recorded and theories as to the reasons for duplication of the sex chromatin mass, and its origin are discussed.
