348 CLASSIFICATION OF REPTILES. 



former broad behind ; tail armed with verti- 

 cillated rings of spines ; no palatine teeth. 

 Sub-genera : Stellio, Uronomastrix, Cyclura, Phyllurus* 



Plattcactylus Cuv. Head and body greatly depressed; 



toes nearly equal, more or less united and 



dilated into disks. 



Sub-genera : typical — Platydactylus, Hemidactylus : aberrant — Ptilo- 

 dactylus, Sphcsrodactylus, and Phyllodactylus. 



AxoLis f 2Ierr. Throat with an enormous extensible pouch ; 

 head and body not depressed ; belly and tail 

 with small unbricate scales f ; a single disk 

 upon the toes. § 

 Sub-genera : Stenodactylus, Dactyloa, Xiphosurtis and AnoUs. \\\ 



Fasult 3. LACERTIDiE. Slender-tongued Lizards. 



Tongue very long, slender, and deeply forked ; no gular 

 pouch, or dorsal crests of spines on the tail or body ; neck 

 thick ; head small, pyramidical, not dilated behind. 



Hydkosackes *\\ Wag. Scales imbedded in the skin, and separated 

 from each other ; tail long, compressed, carinated, 

 with a double crest ; toes long, unequal. 

 Sub-genera : Feranus, Hydrosaurus, Empagusla. 



Heloderma.** The scales of the body resembling detached 

 shield-like plates ; tail rounded, moderate, not 



crested ; the middle toe longest ; tongue ? 



Sub-genera : Heloderma. 



Lacerta. Head pyramidical, narrow behind ; tail long, al- 

 most always rounded ; the scales smooth. 

 Sub-genera : Atneiva, Lacer(a, Scaptei'ra, Acranthos, Draccena. 



ZoxTJRus. " Head depressed, broad behind, with whorls of 

 large keeled spinous scales." 

 Sub.genera undeterminedL 

 Leiolepis.+j- Lizard-shaped ; tongue scarcely extensible, the 

 tip slightly forked and squamose, the hinder 

 portion papillose ; tail very long, with whorls 

 of small, carinated, but not spinous scales. 

 Sub-genera : Leiolepis. 



* The last sub-genus, Pkyllurus, unites this group to the Platydactili. 



f This genus, passing into that oi Polychrus, completes the circle of the 

 Igvam'dis, which stands the first in our series. 



X By this character they preserve their representation to the Agamid^B, 



\ Except in Stenodactylus, which unites this genus with the last. 



II Anolis, passing into Polychrus, completes the circle of this family. 



^ This group seems to pass into the Scincoida. by means of Mr. Gray's 

 new genus Empagusia, which I have placed on the confines of that family. 



** Representing the tortoises and the Agamidce. 



ft Forming the passage between the slender and the thick tongued 

 lizards or IguarUdce. 



