280 ANGUID^, 



Syno^jsis of the Species. , 



I. Ear-opening distinct ; external rudi- 



ments of hind limbs 1. aims, p. 280. 



II. Ear-opening distinct ; no rudiments of hind limbs exter- 



nally. 



Ear-opening much larger than the nostril ; 



10 longitudinal rows of dorsal plates. ... 2. ventralis, p. 281. 

 Ear-opening not larger than the nostril ; 



14 longitudinal rows of dorsal plates ; two 



shields on a line from the nasal to the 



azygos praefrontal 3. attenuatus, p. 282. 



Ear-opening not larger than the nostril ; 



14 longitudinal rows of dorsal plates ; 



three shields on a line from the nasal to 



the azygos prsefrontal 4. gracilis, p. 283. 



III. Ear concealed ; external rudiments 



of hind limbs 5. Jcoellikeri, p. 283. 



1. OpMsaurus apus. 



Pseudopus pallasii, Oray, Cat. p. 55. 

 Lacei'ta apus, Pallas, Reise, iii. p. 702. 

 apoda, Pallas, Novi Comment. Ac. Petrop. xix. 1775, p. 435, 



pis. ix. & X., and Zocyr. Ross.-As. iii. p. 33. 

 Chalcida apus, Meyer, Syn. Rept. p. 31. 

 Chamsesaura apus, Schneid. Hist. Amph. ii, p. 212. 

 Seps sheltopusik, Daud. Repit. iv. p. 351. 



Bipes pallasii, Oppel, Ordti. p. 43 ; Wayl. Icon. Amph. pi. xiv. 

 Pseudopus serpeutinus, Merr. Tent. p. 78 ; Bonap. Faun. Ital. 



oppellii, Fitziny. N. Classif. p. 50. 



pallasii, Cuv. R. A. 2ud ed. ii. p. 69 ; Bibr. inBory de St. Vine. 



Exped. Sc. Moree, Rept. p. 70, pis. xii. & xiii. ; Duvern. R. A., Rept. 



pi. xxiii. ; Dtim. 4" Bibr. v. p. 417 ; Demid. Voy. Russ. Merid. iii. 



p. 340, pi. ii. fig. 2 ; Strauch, Erp. Aly. p. 40. 



durvillii, Cuv. I. c. ; Guer. Icon. R. A., Rept. pi. xvii. fig. 1 \ 



Bibr. I.e. 

 Proctopus pallasii, Fischer, Mem. Soc. Nat. Mosc. iv. 1830, p. 241, 



pis. ii.-iv. 

 Opliisaurus serpentinus, Eichw. Zool. Spec, iii. p. 179. 

 Pseudopus fiscberi, Mencfr. Cat. Rais. p. 65. 

 apus, Schreib. lierp. Eur. p. 362. 



Lateral teeth with subspherical crowns ; teeth on the pterygoids 

 (in two rows), palatines, and frequently also on the vomers. Shape, 

 arrangement, and number of the head-shields extremely similar to 

 those of Anguis frar/ilis, and likewise subject to a certain amount 

 of variation : azygos pra'frontal narrower than the greatest width 

 of the frontal, usually separated from the latter by two or three 



