280 ANGUID.®. 
Synopsis of the Species. 
I. Ear-opening distinct ; external rudi- 
ments of hind limbs ............ 1. apus, p. 280. 
Il. Ear-opening distinct; no rudiments of hind limbs exter- 
nally. 
Ear-opening much larger than the nostril ; 
16 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 prefrontal ........... 000 eee 3. atienuatus, 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 preefrontal................ 4, gracilis, p. 283. 
Ill. Ear concealed ; external rudiments 
of hind limbs ........... 0.0... 5. koellikert, p. 283. 
1. Ophisaurus apus. 
Pseudopus pallasii, Gray, Cat. p. 55. 
Lacerta apus, Pallas, Reise, iii. p. 702. 
apoda, Pallas, Novi Comment. Ac. Petrop. xix. 1775, p. 435, 
pls. ix. & x., and Zocgr. Ross.-As. iii. p. 33. 
Chalcida apus, Meyer, Syn. Rept. p. 31. 
Chameesaura apus, Schneid. Hist. Amph. ii, p. 212. 
Seps sheltopusik, Dawd. Rept. iv. p. 351. 
Bipes pallasii, Oppel, Ordn. p. 43; Wagl. Icon. Amph. pl. xiv. 
Pseudopus serpentinus, Merr. Tent. p. 78; Bonap. Faun. Ital. 
oppellii, Fitsing. NV. Classif. p. 50. 
pallasii, Cuv, R.A. 2nd ed. i. p. 69; Bibr. in Bory de St. Vine. 
Expéd. Sc. Morée, Rept. p. 70, pls. xii. & xiil.; Duvern. R. A., Rept. 
pl. xxiii.; Dum. § Bibr. vy. p. 417; Demid. Poy. Russ. Mérid. iii. 
p- 340, pl. ii. fig. 2; Strauch, Erp. Alg. p. 40. 
—— durvillii, Cuv. Le.; Guér. Icon. R. A., Rept. pl. xvii. fig. 1; 
Bibr. le. 
Proctopus pallasii, Fischer, Mém. Soc. Nat. Mose. iv. 1830, p. 241, 
ls. iL.-iv. 
Oaiisaens serpentinus, Lrchw. Zool. Spec. iii. p. 179. 
Pseudopus fischeri, Ménétr. Cat, Rais. p. 65. 
apus, Schrewb. Herp. 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 fragilis, and likewise subject to a certain amount 
of variation; azygos prefrontal narrower than the greatest width 
of the frontal, usually separated from the latter by two or three 
