THE LIZAKD. 153 



the metatarsal of the first or pre-axial digit (hallux) and 

 that of the second articulates with the tibial side of the 

 tibio-fibulare, the remaining metatarsals with the tarsalia, 

 as described above (§ 114). 



B. Directions for Dissection. 



XIII. Make out the following external characters : — 



116. The elongated, flat-sided trunk, separated iij front 

 by a slight constriction or neck, from the pyramidal, some- 

 what depressed head, and. passing behind into the 

 cylindrical tapering tail, which, in uninjured specimens, 

 may be nearly twice as long as the head and trunk together. 



117. The fore-limbs, springing one on each side from 

 the anterior end of the trunk, towards its ventral aspect : 

 when extended at right angles to the trunk, each is seen to 

 present a dorsal and a ventral aspect, an anterior or pre- 

 axial, and a posterior or post^axial border ; and to consist of 

 three divisions, a proximal, the upper arm, or brachium, a 

 middle, the fore-arm, or antebrachium, and a distal, the 

 hand, or manus ; the latter is terminated by five clawed 

 digits, of which the first, or pre-axial, is the shortest, and is 

 distinguished as the thumb, or poUex ; the fifth, or post-axial 

 digit, is next in size, then comes the second, while the 

 third and fourth are of nearly equal length (cf §§ 89 — 97). 



118. The hind-limbs, springing one on each side from 

 the posterior end of the trunk, towards its ventral aspect : 

 they present the same surfaces and borders as the fore-limbs, 

 and are similalrly divisible into three regions : a proximal, 

 the thigh or femur ; a middle, the shank or crus ; and a 

 distal the foot, or pes : the latter, like the hand, is terminated 



