234 



TYPHLOPIDJE 



1. Typhlopidae, p. 234. 



2. Glauconiidae, p. 242. 



Sync>2>sis of the Families. 



A. No transpalatine; pterygoids not ex- 



tending to quadrate or mandible ; no 

 supratemporal ; prsefrontals forming a 

 suture with nasals ; coronoid present ; 

 vestiges of pelvic arch. 

 a. Maxillary vertical, loosely attached, 



toothed; mandible edentulous; a 



single pelvic bone 



l>. Maxillary bordering mouth, forming 



a suture with praemaxillary, prse- 



frontal, and frontal, toothless'; lower 



jaw toothed ; pubis and ischium 



present, latter forming a symphysis . 



B. Transpalatine present ; both jaws 



toothed. 



a. Coronoid present ; prsefrontals forming 



a suture with nasals. 

 a'. Vestiges of hind limbs ; supratem- 

 poral present. 



a". Supratemporal large, suspend- 

 ing the quadrate 3. Boidae, p. 244. 



b". Supratemporal small,intercalated 



in the cranial wall 4. Dysiidae, p. 249. 



b'. No vestiges of limbs; supratem- 

 poral absent 5. Uropeltidae, p. 251 



b. Coronoid absent ; supratemporal pre- 



sent, suspending the quadrate. 

 ft '. Maxillary horizontal ; pterygoids 



reaching quadrate or mandible. 

 ft". Preefrontal bones forming a 



suture with nasals 



b". Prsefrontals notformiug a suture 



with nasals 



b'. Maxillary horizontal, converging 

 posteriorly toward palatines ; pte- 

 rygoids not reaching quadrate or ur . 



mandible 8. Amblycephalidas, 



c'. Maxillary vertically erectile, per- 

 pendicular to transpalatine; ptery- 

 goids reaching quadrate or man- 

 dible 9. Viperidae, p. 417. 



0. Xenopeltidse, p. 27"). 

 7. Colubridas, p. 277. 



[p. 414. 



Family I. TYPHLOPIDAE. 



Cranial bones solidly united ; no transpalatine ; pterygoids not 

 extending to mandible ; no snpratemporal ; praefrontals forming a 

 suture with nasals ; maxillary vertical, loosely attached, with a 

 few teeth ; no teeth on palate. Mandible edentulous ; coronoid 

 bone present. Vestiges of pelvis, reduced to a single bone on 

 each side. Body covered with uniform cycloid scales ; eyes under 

 the shields. 



