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Show 1880.] MR. W. A. FORBES ON THE UAKARI MONKEYS. 639 other for a very short distance, the frontal and alisphenoid not meeting. On the other hand, in all the New-world Monkeys' skulls that I have examined, the arrangement above described obtains, except in some skulls of the genera. Mycetes and Ateles. Thus of five Fig. 5. Part of side walls of skull of a New-world Monkey (Brachyurus rubicundus). The parietal (P«) and malar (Ma) articulate, as in other members of this group. The same parts in an Old-world Monkey (Cercopithecus pyrrhonotus), showing the parietal and malar separated from each other by the intervention of the frontal (Fr), alisphenoid (Al), and squamosal (Sq), which are shaded obliquely. skulls of the first genus in the Royal-College-of-Surgeons Museum, in one the sutures are invisible on account of age, whilst in the remaining four the union takes place in one only on both sides, |