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Show 22 MU. F. E. BEDDARD OX THE [Jan. 17, The free ribs of the last dorso-lumbar were, however, present on y upon one side. Four ribs reach the sternum on each side, 01 which the last pair are attached to the xiphisternum. Hie sternum shows the unusual character of being not fenestrated. Between the first and second of the caudal vertebrae begin the intercentra. The first, however, are two small nodules only. The chevrons do not commence until the next vertebra. Towards the end of the series the chevrons are occasionally replaced by small nodules. As regards the shoulder-girdle, I have only to remark that the clavicle arises from a point a little way down the scapula. These facts may be supplemented by a comparison of them with the corresponding facts in the osteology of Physignathus lesueuri, a genus not investigated by Siebenrock in his extensive survey of the osteology of the Agamidae. The presacral vertebrae are 24. Of caudal vertebrae I counted 53, and am convinced that not more than one or two are missing. The true cervical vertebrae are four instead of five, in which Physignathus agrees with two individuals out of three of Amphi-bolurus barbatus which I examined from this point of view. In the third specimen there was at least one rib on vertebra 4. The spines of the dorsal vertebrae are much longer in Physignathus than in Chlamydosaurus, while they are still more depressed in Amphibolurus. The last intercentrum lies between vertebrae 5 and 6. The ribs of Physignathus are in all 19 pairs, of which the fifth to the eighth pairs reach the sternum. The first two pairs show a peculiarity not observable in Chlamydosaurus. Each is expanded at its free end, this expansion being specially marked in the case of the second. The last of the sternal ribs is attached much nearer to the proximal end of the xiphisterna than is the corresponding rib of Chlamydosaurus. The sternum itself has in Physignathus the usual two foramina present in so many lizards. It is only the last of the dorso-lumbar series that has no free ribs 3. A Note on the Brain of the Black Ape, Cynopitliecus niyer. By F rank E. B eddaiid, M .A ., F .R.S., Prosector to tlie Society. [Received November 29, 1904.] (Text-figures 11 & 12.) In a recent communication to this Society*, I described among a number of others the brain of Cynopithecus niger, the Celebesian Black Baboon. That brain is still in my possession and is that of a female. Since then 1 have been able to compare this brain * P. Z. S. 1903. vol. i. ii. 12. |