﻿52 INTRODUCTION 



No snake shows any rudiments of the pectoral 

 arch, but remains of the pelvic are found in the 

 Typhlopidce, the Glauconiidce, the BoidcB, and the 

 Ilysiidce. In the first these vestiges are reduced to a 

 single bone (ilium ?) on each side ; in the second they 

 consist of ilium, pubis, and ischium, the latter form- 

 ing a ventral symphysis, and a rudimentary femur ; 

 whilst in the third there is a long ilium, attached to 

 the lower branch of the first bifurcate transverse pro- 

 cess of the lumbar vertebrae, bearing three short 

 bones, the longest of which, regarded as the femur, 

 terminates in a claw-like spur which, in males at 

 least, usually appears externally on each side of the 

 vent. 



