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CLASSIFICATION OF REPTILES. 



Family 3. COLUBERIDiE. Symkes not poisonoiis. 

 Lower jaw mobile ; fangs small, or none. 



Coluber. Anal spines none ; ventral plates broad. 

 Coluber. Head moderate ; nose roundei 

 Heterodon, Xose acute and recurved. 



Spiletes. Scales in long series ; abdominal plates recvirved ; 

 mouth very small. 



Zexodox. Tail short ; head large, distinct ; mouth very wide. 

 Oligudon, Head short, obtuse, narrow. 

 Erpetodryas. Tail long ; head lengthened, distinct ; mouth very wide. 



HuRRiA. Tail conical, anterior caudal plates single, poste- 

 rior double. 

 LioPHis. Head hardly distinct ; mouth small ; hind teethlarge. 



Calamaria. Head not distinct ; tail very short ; caudal plates entire, 



Brachyorrhos. Resembles the last, but the eyes are very small. 



Lycodon. Scales nearly square ; body long, sub-compressed. 



Zenopeltis. Xose rounded ; head plates triangular. 



Scytale. Head ovate, indistinct, plated ; scales equal. 



Dryixus. Head long ; muzzle acute ; tail long ; scales equal. 

 Passirita. The dorsal scales triangular, the lateral linear. 

 Leptophis. Like Dryinus, but the muzzle rounded and obtuse. 



AikiBLicEPHALus. Head high, plated before ; body compressed. 

 DiPSAS. Head short, broad ; body compressed ; vertebral 

 scales square. 

 Cerebus. Head with small scales, and plates before and between the eyes. 



Boa. Vent with two spurs; tail prehensile ; caudal plates simple. 

 Boa. Muzzle with scales ; labial scales variable. 

 Eunectes. Muzzle with plates instead of scales. 



Python. Small plates on the fore part of the head. 



Cenchrus. Head truncate before and behind ; caudal plates simple. 

 Python. Resembles the last, but the caudal plates are double. 

 Gonylophis. Scales of the head and back similar and carinated. 

 Eryx. Head with small scales ; tail short, obtuse ; no anal spines. 



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Family 4. ANGUIDJE. Sloiv-tcorms, 

 Head and body with smooth imbricate scales. 



PsEUDOPUS. Tubercles at the anus ; scales square, thick. 

 Ophisaurus. Like the last, but without anal tubercles. 

 Anguis. Body entirely smooth, surrounded with imbricate 

 scales. 

 Acontias. Tail short ; no rudiments of feet externally or internally. 



Family 5. AMPHISB.ENID.E. Blind-worms. 



Body cylindrical ; the scales forming rings ; tail very shorty 

 _^thick, obtuse ; eyes minute or concealed. 



