ABSTRACT
This chapter discusses the phenomena of reproduction may be considered under the following headings: duration of pregnancy; breeding season; reproductive cycle; and the changes in the sexual skin. Reproductive mechanisms also are extremely varied, but they have been too little studied to be of use in the systematics of more than a very few groups, to which the Primates fortunately belong. Like the Old World monkeys and apes, all the platyrrhine Primates of South America have a unilocular uterus, but beyond the fact that they must be polyastrous, since they seem to breed at all times, practically nothing is known of their reproductive mechanisms. In spite of the wide gaps in our knowledge of the reproductive mechanisms of the Primates, it seems quite plain that the physiological processes are differently developed in the bigger sub-groups of the order. The literature contains no reference to the reproductive mechanisms of the group of Primates.
