The palatine cartilage does not give any clue to the possible ancestry of the Galaginae. It occurs in all Insectivora and even in the Platyrrhini and therefore does not throw any light on the point in question. The cartilago ductus nasopalatini can also be disregarded as it is most probably a cartilage of recent development and even its independence has not yet been conclusively demonstrated. One must, therefore, rely on the outer bar of Jacobson's cartilage which, although it cannot be used as a criterion in mammalian taxonomy, has been shown to be a reliable guide to mammalian affinities, being a remnant of a primitive turbinal. In this characteristic there is a striking agreement between Tupaia and Galago, not only in the mere presence of the outer bar but also in the finer details thereof. The presence of this element in Galago indicates a low state of development. It has been shown by Broom (1915) that Tupaia and Macroscelides agree in practically every detail with the Marsupialia, as far as Jacobson's organ and its cartilages are concerned.

Although the supposed relationship between the Lemuroidea and the Tupaiidae as maintained by Gregory (1910), Le Gros Clark (1925), Wood Jones (1929), Simpson (1945) and others, is still emphatically denied by some, the conditions of the organ of Jacobson and its cartilages provide additional proof of the intimate relationship supposed to exist between the Primates and the Tupaiidae.