234 



TTPHLOPIDiE 



Spi02)sis of tlie Families. 



A. No transpalatine ; pterygoids not ex- 



tending to quadrate or mandible ; no 

 supratemporal ; prfefrontals forming a 

 suture with nasals : coronoid present ; 

 vestiges of pelvic arch. 

 a. Maxillar}- vertical, loosely attached, 



toothed ; mandible edentulous ; a 



single pelvic bone 1. Typhlopidse, p. 234. 



h. Maxillary bordering mouth, foniiiug 



a suture with prannaxillary, prae- 



frontal, and frontal, toothless ; lower 



jaw toothed ; pubis and ischium 



"present, latter forming a symphy.^is . 2. Glauconiidae, p. 242. 



B. Transpalatine present ; both jaws 



toothed. 

 (I. C oronoid present : prajfroutals forming 

 a suture with nasals. 

 «'. Vestiges of hind limbs; supratem- 

 poral present. 

 a". Supratemporal large, suspend- 

 ing the quadrate 3. Boidse, p. 244. 



h". Supratemporal small,intercalated 



in tlie cranial wall 4. Ilysiidse, p. 249. 



//. No vestiges of limbs; supratem- 

 poral absent 5. Uropeltidae, p. 251. 



h. Coronoid absent ; supratemporal pre- 

 sent, suspending the quadrate. 

 a'. Maxillary horizontal ; pterygoids 

 reaching quadrate or mandible. 

 a" . Prefrontal bones forming a 



suture with nasals C. Xenopeltidae, p. 27o. 



h". Pra3frontals not forming a suture 



with nasals 7. Colubridge, p. 277. 



h'. Maxillary horizontal, converging 

 posteriorly toward palatines ; pte- 

 rygoids not reaching quadrate or [p- 414. 



mandible 8. Amblycephalidas, 



c'. Maxillary vertically erectile, per- 

 pendicular to transpalatine; pterj'- 

 goids reaching quadrate or man- 

 dible 0. Viperidae, p. 4] 7. 



Family I. TYPHLOPID.^. 



Crauial bones solidly united ; no transpalatine ; pterygoids not 

 extending to mandible ; no supratemporal ; prfefrontals forming a 

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

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

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

 each side. Body covered -^-itli uniform cycloid scales ; eyes under 

 the shields. 



