IX. On the posterior lobes of the cerebrum of the quadrumana

Tiedemann states that the hippocampus minor is not found in the brain of Monkeys, or of any other animals which he had examined, but is peculiar to Man*. In his figure of a horizontal section of the brain of Simia nemestrina, a part is described as “scrobiculus parvus loco cornu posterioris,” and the drawing corresponds with the description. Many writers on human anatomy have followed Tiedemann’s statement; thus Cruveilhier observes, “ Du reste, l’ergot [hippocampus minor] de même que la cavité digitale [posterior cornu of the lateral ventricle] n’existe guères que chez l’homme, sans doute parce que l’homme seul présente un grand développement de la partie occipitale du cerveau†.” More recently, the presence of a “posterior lobe” of the cerebrum, a “posterior horn of the lateral ventricle,” and a “hippocampus minor” have been affirmed by an eminent authority in this country, to be the distinguishing characteristics of the human brain‡.