Chimpanzee _Anthropopithecus calvus_ of Africa. Orang-Utan _Simia satyrus_ “ Borneo. Gray Gibbon _Hylobates leuciscus_ “ “ II. Old World Monkeys and Baboons. Mona Monkey _Cercopithecus mona_ “ Africa. White-Collared Mangabey _Cercocebus collaris_ “ “ Magot: Barbary “Ape” _Macacus inuus_ “ N. Africa. Japanese Red-Faced Monkey _ “ fuscatus_ “ Japan. Pig-Tailed Monkey _ “ nemestrinus_ “ E. India. Rhesus Monkey _ “ rhesus_ “ India. Entellus Monkey _ “ entellus_ “ “ Black “Ape” _Cynopithecus niger_ “ Celebes. Golden Baboon _Papio babuin_ “ N. Africa. Hamadryas _ “ hamadryas_ “ Arabia. Mandrill _ “ mormon_ “ W. Africa. Gelada _Theropithecus gelada_ “ Abyssinia. III. New World Monkeys. White-Throated Sapajou _Cebus hypoleucus_ “ S. America. Red-Faced Spider Monkey _Ateles paniscus_ “ “ “ White-Headed Saki _Pithecia leucocephala_ “ “ “ Yarkee: Short-Tailed Monkey _Brachyurus calva_ “ “ “ Squirrel Monkey _Chrysothrix sciurea_ “ “ “ Common Marmoset _Hapale jacchus_ “ “ “ Douroucoli _Nyctipithecus trivirgatus_ “ “ “ IV. Lemurs and Lemuroids. Ring-Tailed Lemur _Lemur catta_ “ Madagascar. Indri _Indri brevicaudata_ “ India. Galago _Galago galago_ “ Madagascar. Slow Lemur _Nycticebus tardigradus_ “ Madagascar. Aye-Aye _Cheiromys “ India. madagascariensis_ [Illustration: CHIMPANZEE BALDY.] Nearly all the above-named species are now living in the Primate House, besides which there are many others. So far as the available supply of captive primates will permit, these typical species will constantly be kept on exhibition, together with many others equally interesting. In this small volume it is possible to notice only the most important forms.