KEPTILES. G03 



Gentes 3.— ACONTIAS.— Oa-(Vr. 



Generic Character.— Vfilhout sternum or pelvis ; teeth conic ; second 

 lobe of tlie lungs merely rudimentary. 



TRIBE II. — 8ERPENTE8. 



Having no sternum, nor scapular bones, and without a third eyelid. 



Sub-Division I. — Jaws not capable of dilation. 



Genus i.—AUVHlSBJE^A.—Liimcens. 



Generic Character.— Body encompassed by circular annulations of quad, 

 rangular scales ; a row of spiracles before the anal region ; teeth few, and 

 in the jaws only ; oviparous. 



Genus 5.—TYPHl,OTS.—Sch7ieider. 



Generic Character. — Snout depressed, provided with plates; tongue long, 

 bifurcated ; eyes scarcely visible ; body covered with small imbricated 

 scales; anus near the extremity of the body. 



SuB-DiTisioN II. — Jaws capable of great dilation. 



Genus 6.— TORTRIX Oppel. 



Generic Character.— Abdominal scales, and those under the tail, larger 

 than the others ; tongue thick and short ; tail very short. 



Genus 7.— BOA. — Linnceus. 



Generic Character. — Anal region provided with a hook on each side ; body 

 compressed, inflated towards the middle ; tail prehensile ; scales small, and 

 particularly so upon the back of the bead. 



Boa constrictor.— The Great Boa. Plate Ixiv. fig. 6. Described, vol. iv. 

 p. 1S7. 



Genus 8.— ERIX.— Daarfzw. 



Generic Character. — Under the body and tail a row of longitudinal scales 

 of a large size ; liead with nine plates ; teeth small and pointed. 



Genus 9.-ERPET0N — Lacepede. 



Generic Character. — Head with large plates, having two soft protuber- 

 ances covered with scales, at the point of the muzzle ; those of the abdnraeii 

 smaller ; the scales under the tail difterent from the otiiers. 



Genus 10.— PYTHON.— DawdiB. 



Generic Character. — Anal region furnished with lateral hooks ; neutral 

 plates narrow ; plates of the head large and numerous. 



Genus 11 — HUKRIA.— DauAn. 



Generic Cliaracter.— Body wiih a single row of longitudinal plates under- 

 Qcaih ; tail with a double row. 



Genus VL—JUVSA^.—Laurenti. 



Generic Character.— Head broader than the body, which is compressed j 



