CKOCODILIANS, LIZARDS, AND SNAKES. 



495 



HoLBUOOK, Am. Ilerp., 2d cd., II, 1842, ji, 139, pi. xx. — Dumkril, Cat. Coll. 



Kept., 1851, p. 144.— Y.VKKOW, Bull. U. S. Nat. Mus., No. 24, p. 4P.— Bou- 



LEXGER, Cat. Liz. Brit. Mus., 1885, II, p. 281. 

 Angnis ventraUs Lixx.Etis, Syst. Nat., 12th ed., II, 17f)6, p. 391. — Doxndokf, Zool. 



Beytr., Ill, p. 2(57.— Shaw, Geu. Zool., Ill, pi. 2, p. 581.— Latreille, Hist. 



Nat. Rept., IV, p. 223. 

 Chamwsaura renlraUs Schneider, Hist. Amph., II, 1804, p. 215. 

 Ilyaliiius vaUralis Mehiulm, T(!ut. Syst. Auipli., 1820, p. 79. 

 AngulsfragUis G.mklin, Syst. Nat., 1798, p. 1112. 

 OpIihanritapHnctatuH CuviER, Rc'gne Anim., 2d ed., II, 1829, p. 70. 

 Ophisauriis striatuhis Cuvif.r, R(~^gne Auim., 2d ed., II, 1829, p. 70. 

 ()})liisauriis linealus Cr.w, Cat. Slender-touguo Sanrians, Ann. Mag., I, 1838, 



p. 391. 

 Ojihisaurns veKlralis Hai.lowell, Proc. Acad. Nat. Sci. I'hila., VIII, 185(5,1). 239; 



1856, p. 307. 



There is a large and broad oblong frontal plate, and behind it a pen- 

 tagonal interparietal, bordered by an elongate parietal plate on each side. 

 The interfrontouasal is half as long as the frontal. There are two 



Fig. 88. 



OrnisAUuiTs ventralis ventkali.s Linn.»u's. 



Xi. 



i:it. No. 145M, U.S.N. M. 



frontoparietals which are in contact with the fonrth sdpraocular plate. 

 There are two series of plates, supraorbitals and superciliaries, along 

 the edge of the head, above the eye. The eyelids are distinct, the lower 

 well covered with scales. There are two pairs of interuasals and a 



