290 CLASS XV. 



degree in one and the same individual on opposite sides. These parts 

 appear to be more developed in males than in females. It has been doubted 

 whether they are really glands, and whether the organ under the grooved 

 tubercle ought not rather to be referred to erectile tissue ^. 



OpMsaurus Daud., Cuv., FiTZ., HyaUnus Merk. Teeth in 

 jaws conical ; palatine teeth small, numerous, in several rows. 

 Auditory aperture small, transverse, behind the angle of mouth. 

 Scales hard, osseous, the dorsal quadrangular, carinate, the ventral 

 smooth, transverse, tetragonal. Extremities none. Lateral fur- 

 row on each side produced as far as vent. Body anguineous ; tail 

 longer than trunk. 



Sp. OpMsaurus ventralis Daud., Anguis ventralis L., Daud. Rept. vii. PL 

 88. (V. PI. 6r, figs. 40, 41, the head), Cuv. R. Ani., id. ill., Rept. PL 24, 

 fig. 1 (the cranium is figured in Cuv. R. Ani., 6d. 1. PI. iv, id, 11. PL viii. 

 figs. 7 — 9) ; this animal grows to 2' in length, and is met with in North 

 America ; the tail is brittle, like that of the slow-worm, which peculiarity 

 has occasioned the name oi glass snahe, given by the Anglo-Americans. 



Pseudojms Merr. Palatine teeth small, in a single row. Scales 

 all carinate, the carina more distinct in the caudal. Two rudiments 

 of hind feet, adactylous, very small at the end of lateral furrow. 

 (Remaining characters of OpMsaurus, from which it scarcely differs 

 generically.) 



Sp. Pseudopus Pallasii Gov., Pseudopus serpentinus Merr., Lacerta apoda 

 Pallas, Nov. Comment. Acad. Petrop. xix. 1774, pp. 435 — 454, Bechst. 

 Naturgesch. d. Amphib. 11. Tab. 27, fig. 3, Pseudopus DurvilUl (the young 

 animal) Guerin Icon., Rept. PL 17, fig. i; the scheltopusih ; this lizard, 

 ranked by CuviER amongst the serpents, attains a length of more than 

 three feet. Pallas first discovered this animal in Astrakan, where it 

 occurs in the bushy valleys of the sandy steppes ; it is met with also in 

 Greece and Dalmatia. 



Chammsaura FiTZ., Wagler (Species of Chamcesaura 

 ScHNEiD.), Monodactylus Merr. Palatine teeth none. Body 

 anguineous, covered all over with lanceolate scales, without lateral 

 furrows. Four very short feet undivided, subulate. Tail very 

 lono". 



1 Compare on these parts, besides J. Mueller, who investigated them in Poly- 

 chrus marmoratm (De glandular, secern, structura, p. 43. Tab. i. fig. 22), C. F. 

 Meisner DeAmphibiorum qiiorimdam papillis glandulisque fcmoralibus, Basilise 1832, 

 4to, and Otth, Ueber die Schenkelwarzen der Eidechsen, in Tiedem. u. Treviranus 

 Zeitschr. fur Physiol, v. i, 1833, PP- loi — 104. 



