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Show 1905.] ANATOMY OF THE FRILLED LIZARD. 21 not in reality belong to the arch to which it is attached, but is a persisting fragment of the second postoral arch, we should be able to bring the Lacertilia into line with the Chelonia, where the true hyoid arch is small and is followed by two better developed branchial arches. At present, however, I can only make the suggestion, after recording the facts. Text-fig. 10. Vertebral Column and Ribs.-I find in Chlamydosaurus that there are 23 presacral vertebrae and 49 caudals ; of the latter I am inclined to think that none are missing. Of cervical vertebra that is vertebrae entirely without ribs, I found in two individuals Jive, which is one or two more than the usual number. The last intercentrum of the anterior vertebrae lies between Nos. 6 and 7. The dorso-lumbar vertebrae all possess ribs, even the last of the series, which in the Agamidae generally * does not bear free ribs. * Siebenrock, " I)as Skelet der Agamidaj," SB. k. Akad. Wiss. Wieu, vol. civ. |