868 The American Naturalist. [October. 
Geccovarani; Uroplatidae. 
Nyctisaura; Eublepharidae, Gecconidae. 
Leptoglossa ; Xantusiidse, Teida^, Lacertidae, Gerrhosauridae, 
Typhlophthalnii ; Acontiidae, Anelytfopidae. 
Anguisauri ; Aniellidae. 
Opheosauri; Chirotidae, Amphisbaenidae, Trogonophidse. 
The Pythonomorpha embraces two families, the Plioplatecar- 
pidae, and the Mosasauridae. 
The Ophidia include the following superfamilies. 
A. Supratemporal intercalated in the cranial walls. [Angio- 
a. No ectopterygoid; palatines bounding choanal post- 
eriorly; ethmoturbinal forming part of roof of mouth ; 
rudiments of a pelvis. (^Scolecophidia) 
Maxillary bone fixed to perfrontal and premaxil- 
lary ; a pelvis ; Catodonta. 
Maxillary bone vertical and free from all others; 
no pelvis ; Epanodonta. 
aa. An ectopterygoid ; palatines not bounding choanae 
posteriorly. 
Maxillary bone free, horizontal ; Tortricina. 
AA. Supratemporal attached scale-like to cranial walls, pro- 
duced freely posteriorly; ectopterygoid present {Eury- 
Maxillary bone horizontal, in contact with the 
premaxillary, and furnished with solid teeth; 
no rudiments of pelvis ; Asinea. 
Maxillary bone horizontal, thickened in front, and 
not reaching premaxillary, and bearing a 
perforate tooth ; Proteroglypha. 
Maxillary bone vertical, not reaching premaxil- 
lary, articulating with the prefrontal by a 
ginglymus, and to the ectopterygoid without 
imbrication, and bearing a perforated tooth ; Solenoglypha. 
The families embraced by these superfamilies are as follows : 
Catodonta ; Stenostomidae. 
