226 PROCEEDINGS OF THE ACADEMY OF 



Pterygoids not touching sphenoid. 



Frontal arching under olfactory lobes. 



Parietal double ; attachment of occipital segment very open ; gomphosis 



internal. 

 Temporal with anterior vertico-oblique wing ; superior plate produced beyond 



arched body, forming abutment for columella. 

 Orbitospheuoid wanting. Arches incomplete. Suspensoria two. 

 Vertebra? usually ampiccelian. 

 Tongue papillose. 

 Nyctisaura. 



PLEURODONTA. 



.Shanks of teeth cylindrical, attached to inner side of one alveolar wall. 



Coronoid bone produced anteriorly, not posteriorly. 



Articular, when present, separate from angular, (except in one tribe.) 



Subarticular little developed on inner, usually much on outer face of ramus. 



Groove for Meckel's cartilage nearly always more or less completely closed. 



Splenial nearly always elongate. 



Premaxillary in contact with vomers, (with two or three exceptions.) 



Pterygoids not touching sphenoid. 



Parietal single, receiving gomphosis of the usually slightly attached occipital 



internally. 

 Temporal with inferior longitudinal wing only, columella abutting on parietal 



or incomplete. Suspensoria nearly always two. 

 Orbitosphenoid wanting ; vertebras procoelian. 



Iguania, Dijiloglossa, Thecaglossa, Leptoglossa, Typhlopldhalmi. 



OPHIOSAURI. 



Coronoid bone little developed externally, covering articular internally. 



Articular united with angular. 



Subarticular little visible externally ; elongate internally. 



Splenial smnll ; Meckel's cartilage covered on the inner side. 



Premaxillary well developed, in contact with vomer. 



Pterygoids in close contact with spheuoid. 



Frontal under-arching olfactory lobes. 



Orbitosplienoid present. 



Parietal single, with a close articulation to occipital by external gomphosis. 



Temporal without wing, continuous with parietal. No columella. 



Arches wanting. Suspensorium, one. 



Vertebrae procoelian ; tongue scaly. 



Amphisb<enia. 



The characters of the tribes and the families embraced by them are as 



follows : 



ACRODONTA. 



RmrTOGLossA. 

 Parietal arch elevated, formed of squamosal and parietal ; latter not extend- 

 ing to mastoid. 

 Vertebne procceUan. 

 Columella wanting. 



Clavicle and mesosternum wanting. Xiphisternal without fontanelle. 

 No angular process of mandible. Splenial none. 

 Tongue papillose ; terminal portion projectile on glosso-hyoideum. 

 Toes short, opposable in two and three. Chamseleontidae 



Pachyglossa. 

 Parietal arch not elevated, composed of mastoid and parietal in contact. 

 Columella present, (sometimes very short.) 



[Oct. 



