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 J . 



OpMsaurus DAUD., Cuv., FITZ., Hyalinus MERR. 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. Ophisaurus ventralis DAUD., Anguis ventralis L., DAUD. Kept. vn. PL 

 88. (v. PI. 6r, figs. 40, 41, the head), Cuv. R. Ani., ed. ill., Rept. PL 14, 

 fig. i (the cranium is figured in Cuv. R. Ani., 6d. I. PL rv, Gd. II. PL vui. 

 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 of glass snake, given by the Anglo-Americans. 



Pseudopus MERE. 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 Ophisaurus, from which it scarcely differs 

 generically.) 



Sp. Pseudopus Pallasii Cuv., Pseudopus serpentinus MERR., Lacerta apoda 

 PALLAS, Nov. Comment. Acad. Petrop. xix. 1774, pp. 435 454, BECHST. 

 Naturgesch. d. Amphib. II. Tab. 27, fig. 3, Pseudopus JDurvillii (the young 

 animal) GUJ^RIN Icon., Rept. PL 17, fig. i; the scheltopusilc ; 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. 



Chamcesaura FlTZ., 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 

 long. 



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

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

 MEISNER De Amphibiorum quorundam papillis glandulisque femoralibus, Basilise 1832, 

 4to, and OTTH, Ueber die Schenkelwarzen der Eidechsen, in TIEDEM. u. TREVIRANUS 

 Zeitschr. fur Physiol. V. i, 1833, pp. 101 104. 



