LACERTILIA. 351 



crests on the inalo, C. Amer., B americanus to 3 ft. ; Brachylophus 

 Wag!., Fiji and Friendly Islands ; Cachryx Cope, Yucatan ; Callisaurus 

 Blainv., S.W. N.-Amer. ; Ghalarodon Ptrs., Madagascar ; Chamaeleolis 

 Coot., Cuba ; Conolophus Fitz., herbivorous, edible, Galapagos ; Cory- 

 thophanes Boie, C. Amer. ; Crotaphytus Holbr., S. N.-Amer. ; Ctenoble- 

 pharis Tsch., Peru ; Ctenosaura Wiegm., C. Amer. ; Cyclura Harl., 

 W. Indies ; Diplolaemus Bell, Patagonia ; Dipsosaurus Hall, S.W. N.- 

 Amer. ; Enyalioides Blgr., Veragua to Peru ; Enyalius Wagl., S. Amer. ; 

 Helocephaliis Pliil., Atacama and N.W. la Plata ; Holbrookiu Gir., S. N.- 

 Amer. ; Hoplocercus Fitz., S. Amer.; Hoplurus Cuv., Madagascar ; Iguana 

 Laur., attain to 5-0 ft., herbivorous, esteemed as food, they live in trees, 

 trop. Amer. and W. Indies ; Laemanctus Wiegm., C. Amer. ; Lioce^ihalus 

 Gr., digits with keeled lamellae, W. Indies and S. Anaer. ; Liolaemus 

 Wiegm., Amer. S. of equator, about 25 species ; Liosaurus D. and B., 

 S. Amer. ; Metopoceros Wagl., W. Indies ; Norops Wagl., trop. Amer. ; 

 Ophryoessa Fitz., S. Amer. ; Petrosaurus Blgr., Lower California ; Phry- 

 nosoma Wiegm., horned toads, N. Amer., and Mexico ; Phymaturus 

 Gravh., Chili ; Pneustes Merr., Paraguay ; Polychrus Cuv., abdominal 

 ribs, colour very changeable, digits with carinated lamellae ; trop. 

 Amer. ; Pristidactylus Fitz., Patagonia; Saccodeira Gr., S. Amer. : Sauro- 

 malus A. Dvim., S.W. N.-Amer. ; Scartiscus Cope, Paraguay ; Sceloporus 

 Wiegm., N. and C. Amer. ; Stenocercus D. and B., W.S. Amer. ; Strobiiurus 

 Wiegjn., Brazil ; Tropidodactylus Blgr., Venezuela and W. Indies ; Tro- 

 pidurus Wied., S. Amer., digits with keeled lamellae ; Uma Baird, 

 Ai'izona ; Uraniscodon Kaup, S. Amer. ; Vrocentron Kaup, S. Amer, ; 

 Urostrophus D. and B., S. Amer. ; Uta B. and G., N.-Amer. and Mexico ; 

 Xiphocercus Fitz., trop. Amer. 



Fam. 7. Xenosauridae. Pleurodont, teeth numerous, small, with long 

 cylindrical shafts not hollowed out at the base ; anterior part of tongue 

 retractile ; palatines widely separate ; T-shaped interclavicle ; osteodermal 

 plates absent from the body. Xenosaurus Ptrs., with one species, S. 

 Mexico. 



Fam. 8. Zonuridae. Pleurodont, teeth as in preceding, but hollowed 

 out at the base ; tongue short not retractile ; supratemporal fossa roofed 

 over by dermal ossifications ; palatines and pterygoids widely separated, 

 interclavicle cruciform ; no abdominal ribs. Zonurus Merr., dermal 

 ossifications on the trunk and tail, S. Afr. and Madagascar ; Pscudo- 

 cordylus Smith, S. Afr. ; Platysaurus Smith, S. Afr. ; Chamaesuura 

 Schn., snake-like body and reduced limbs. S. Afr. 



Fam. 9. Anguldae. Pleurodont, teeth solid at the base, new teeth 

 originate between the old ones ; teeth may be present on the pterygoids, 

 palatines and vomers (Ophisaurus) ; anterior part of tongvie emarginate, 

 retractile into the posterior part ; osteodermal plates on head and body ; 

 palatines and pterygoids well separated ; limbs variously developed, may 

 be absent, but limb-girdles always present; terrestrial ; Angnis is viviparous ; 

 Amer., Eur., India. Gerrhonoius W^ieg., 4 well-developed pentadactyle 

 limbs, W. and S. N.-Amer., C. Amer. ; Ophisaurus Daud. [Pseudopus 

 Merr.), limbs absent, or reduced to vestiges of the hind pair, S.E. Eur., 

 N. Air., S.W. Asia, S. N.-i\jner., Mexico ; 0. apiis Pall., the glass-snake, 

 Balkan Peninsula etc. Diploglossus Wieg., limbs pentadactyle, well 

 developed, trop. Amer. ; Sauresia Gr., limbs tetradactyle, W. Indies ; 

 Panulopua Cope, 4 limbs, anterior without digits, posterior with a rudi- 

 mentary digit on the inner border, W. Indies ; Ophiodes Wagl., no forelimbs 



