IGUANA SPIIENODON BBEVILINGUIA. 



219 



Tympanic membrane usually exposed. Many of them have a spiny dor-a : 

 crest, and change their colour like the Ghamselcon^. 



The following Iguanas belong to the \vestern hemisphere, and are pleurodoat : 

 Polychrvg murnioratus Cuv., Brax.il ; Tyuii-na tv/ltcrfiilntn La,UT.=8apidissiina 

 Men 1 ., West Indies; /. dclicatissiina Lanr.. tropical America : /;/// n>;i i-uri/mt,/ 

 Gray. Cuba ; Haxiliftcuts niitratux Daucl., South America. 



The following belong to the eastern hemisphere, and arc acrodont : Calt>'--< 

 ophiomaehux Merr., East Indies; Druc>> rolanx L..Java: Lojttiium ainl>oi>i< n*i* 

 Schloss. 



The New Zealand genus, llnth i-'nt = Xji//< //m/n//, which was formerly reckoaed 

 among the Iguanidte. shows such considerable differences in its organization 

 that (iiinther established for it a third order of sealy Reptiles under the name 

 of Rhynchocephalia, * which Huxley hoi, Is to be allied to the extinct Triassic, 

 Lacertilian genera Hypn-ndnju'don and Ifhi/Hchoxttunix. 



Fam. Humivagse. Lizards with broad Hat body, supported by shorter limbs; 

 of almost toad-like aspect. The skin is not uufrequently covered with spiny 

 scales. They live on the ground in stony and sandy places, where they hide 

 themselves in pits and holes. 



To the Ifn m ii'ii/j cc of America, which are all pleurodont. Ic'iong Phry>n>x<i/a 

 ii I/i // \Viegm.. Tapayaxin. Mexi>-<> : TriijinJui'iix i-i/i-lnni* \Vied., Urazil. 



FIG. 6ii. S'(-;c.v i>ffi<-i,i 



veifiie animal). 



To the Ilinnicagie of East India and Afnea. which are acrodont. and possess 



canine teeth. li.-long Pfirynecfplialitx fir/i^xrojn/s Kp.. Siberia : Uromuxti-i- 



xpinijtrx Merr., Egypt ; Af/ania colon orinn Daud.. Egypt : SfcU'm nihjarix Latr., 

 Hardun, Egypt. 



Sub-order 4. Brevilinguia. Scaly lizards, with elongated, often 

 snake-like body. The limits are very diversely developed. The 

 tongue is short and thick, without sheath, more or less indented at 

 the thinner anterior end, and but slightly protrusible. Eyelids are, 

 as a rule, present. The tympanic membrane is often concealed 

 beneath the skin. 



Fam. Scincoidese. Saud-LizanU. The more or less snake-like body is covered 

 with smooth bony scales. The crown of the head is invested with larger scutes. 

 Ani/iiix fragilis L., Blindworm, Europe : Si-'nicux otKcintili* Laur. (tig. G44) 

 Egypt; Seps chalcidica Merr., Dalmatia : Acontuis mulcagrix Cuv.. Cape. 



A. 



C- thither. ' Contribution of the Anatomy of Hatteria {Rhynrhoce- 

 Cray.'' Phil. Trans. lfy. Xnr.. London, vol. 157. ii.. 18(57. 



