ABSTRACT
C. Tate Regan suggestion is that both the platyrrhine monkeys and the Tarsioidea evolved from Lorisiform, and the catarrhine Primates from Lemuri-form, ancestors. The idea of lower and higher in a phylogenetic sense could emerge only as part of the doctrine of descent, and in a system in which transformation plays a part. In this school of thought the post-Darwinian systematists were steeped, and when they inherited the pre-Darwinian classification of the Primates, they were not slow to interpret it phylogenetically. In the school of thought the post-Darwinian systematists were steeped, and when they inherited the pre-Darwinian classification of the Primates, they were not slow to interpret it phylogenetically. In order to facilitate reference, the classification is given in some detail in the case of the catarrhine division of the sub-order Pithecoidea. Knowledge about systematic differentiation in the fields of physiology and behaviour is not yet available with respect to other groups.
