CROCODILIANS, LIZARDS, AND SNAKES. 621 



Like Senira, but limbs nulimental, iiudividcd.. y/rac/iz/wteZf'si Diinit'ril and IJiiirou. 

 Nostril pierced between an upper and a lower nasal; limbs pentadactyle, the 



digits denticulated laterally Svinciis Laurenti. 



Nostril piereed between the nasal and supranasal ; digits l-'L . Zijgnopsia Blanford. 



Like Zijynopeis, but digits 3-;i Sphenoscincns Peters. 



Like Zytjnop»ix, but digits 3-2 Hintipodiiim Steiudacliner. 



Like Zijgnopsin, bat limbs absent Ophe.omorux Dumeril and Ijibron. 



II. Nostril pierced in the posterior border of the rostral, or between a nasal or a 

 labial and the rostral. 

 A. Palatine bones in contact on the median line. 



Nostril pierced between the rostral and a very small nasal, which may be reduced 

 to a narrow ring. 



Digits 5-5; frontoi)arietals distinct Thyriis Gray. 



Digits 5-5; no frontoparietals or Y>Tefroiiti\ls .. A nqyliii/Ioasus Dumeril and. Bibron. 



Digits 3-3 Sepomorph us Peters. 



No fore limbs ; hind limbs didactyle Scelotes Fitzinger. 



No fore limbs; hind limbs undivided Podoclonium Cope. 



No limbs externally Herpetoaaara Peters. 



AA. Palatine bones separated on the median line. 



1. Suprauasals present; first ujiper labial not touching the nostril. 



*" Nostril pierced between the rostral and a very small nasal in an emargina- 

 tion of the former shield. 

 a. Labial border rounded. 



Digits 5-5 Gongylus Wagler. 



Digits 4-4 < i ongyloseps Boettger. 



Digits 3-4 A llodactijhis Lataste. 



Digits 2-4 Anisotoma Dumeril. 



Digits 3-3 Chalcides Laurenti. 



Digits 2-3 Heteromeles Dumeril and Bibron. 



Digits 1-1 (limbs undivided) Didoniseu.s Cope. 



aa. I^abial border projecting, acute. 



Digits 4-5 — 4-5 iijjha'tiops Wagler. 



** Nostril pierced between the rostral and a very small nasal, which is situated 

 between the former shield and the lirst labial. 



Uerpetoscps Boulenger, 



2. Supranasals present; first upper labial entering the nostril. 



' Nostril pierced between the rostral, the supranasal, the postnasal, and the 

 first labial; no frontoparietals. 



Digits 5-5 Meaomi/cterus Cope. 



Digits 4-4 Iiliino.scin€ux Peters. 



Digits 3-3 Sepsiiia Bocage. • 



No forelimbs; hind limbs undivided Diimerilia Bocage. 



'" Nostril pierced between the rostral and the lirst labial. 



Limbs absent Mtdtiiioscps Boulenger. 



"** Nostril pierced between the rostral, the supranasal, and the first labial; 

 frontoparietals present. 



Limbs absent Lepoph is Beddart. 



3. No supranasals; nostril entirely in the rostral. 



Liuibs short; digits 4-4 Clialcidoscps Boulenger. 



