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Show 1905.] ON TIIE ANATOMY OF THE FRILLED LIZARD. 9 In front of the frontal bone, between it ancl the nasals, is a squarish piece of bone distinct from both of these. In many Agamidge there exists, according to Siebenrock, a fontanelle in this region, and the same occurs in Iguana and Phrynosoma. It is, however, according-to Siebenrock, filled up in the full-grown lizard, and thus a character of youth. The plugging up of the vacuity by a separate bone in Uromastix, not mentioned by Siebenrock, leads me to the inference that this bone is to be looked upon not as a detached fragment of the frontal-a, wormian bone, but a,s an ossified mesethmoid comparable to that which exists upon the surface of the skull in some Struthious birds, &c. 2. A Contribution to tlie Anatomy of tlie Frilled Lizard (Chlamydqsaurus kingi) and some other Agamidce. By F rank E. B eddard, M.A ., F .R .S V Prosector to the (Society. [Received November 29, 1904.] (Text-figures 5-10.) Except for its muscular anatomy, which lias been described by Mr. de Vis *, and for certain points in its osteology which have been described by Dr. Mivart t and Prof. Dollo t, the structure of the genus Chlamyclosaurus appears to be but little known, though the external characters § and habits || have been studied and recorded by many naturalists. The following pages contain a contribution to our knowledge of this Lizard as compared with allied genera among the Agamidae, of which family it is undoubtedly to be reckoned a member. Lungs.-Seeing that the lungs of the Lacertilia are evidently capable of considerable variation and that the habits of Chlamy-dosaurus and Physignathus are very different, it is not remarkable that their lungs show certain differences of structure. They are, however, broadly similar and constructed upon a plan which characterises the family Agamidae- to which these two genera belong-and the Iguanidae. This is seen in the fact that the lung (both right and left) is divided into two non-communicating compartments, only communicating-that is to say-indirectly through each bronchus. The tip of each lung which is continued headwards beyond the bifurcation of the bronchi constitutes the second and smaller compartment of the lung. This, however, * Proc. Linn. Soc. N. S. W . viii. 1883, p. 300. f Article " Reptilia," Encycl. Brit. 9th ed. J Rev. Quest. Sci. xix. p. 318. § Gray in King's Survey of Australia, ii. p. 4 24; Dumeril and Bibron, Erpetol. Gen. p. 4 4 0 ; Boulenger, Brit. Mus. Cat.; Beddard, P. Z. S. 1904, vol. ii. p. 82, Encycl. Brit. 9th ed., Article " Lizard." || Savile Kent, P. Z. S. 1895, p. 712. Milano, " Beitrage z. Kenntniss d. Reptilienlungen," Zool. Jahrb. (Abth. f. Anat.) vii. p. 545 ; he does not deal with either of the types described above. |