Omomys, i. [117]; ii. [226], [238]

carteri, i. [117]; ii. [252]

opisthostictus, Cercopithecus, ii. [72]

Opisthotomus, i. [123]; ii. [227], [238], [252]

Opolemur, i. [61]; ii. [226], [237], [248]

samati, i. [62]

thomasi, i. [63]

Orabassu Titi, i. [162]

Orang-utan, ii. [170], [174]

Orangs, ii. [143], [146], [148], [149], [167], [171], [183]