8. LYGOSOMA. 223 



YIII. Limbs very short, with loss than five digits. Lower eyelid 

 with an undivided trans])arcnt disk. Ear covered with scales. 

 No supranasals. Pra^frontals well developed. Frontal not 

 broader than the supraocular region. {Ilcmienjis, Wagl.) 



Limbs tetradactyle 134. peronii, p. 326. 



Limbs iridactyle 135. decresien^e, p. 327. 



Limbs didactyle 136. qiiadriUneatum, 



[p. 328. 



IX. Limbs more or less developed. Lower eyelid scaly or with a 

 transparent disk. Ear covered with scales, or very minute. 

 No supranasals. Prefrontals (in the species with short limbs) 

 minute or absent. Frontal not broader than the supraocular 

 region. (Siaj^Jios, Gray.) 



A, Limbs overlapping when adprcssed ; prasfrontals well de- 



veloped. 



Lower eyelid with an luidivided trans- 

 parent disk : 22 scales round the body 137. infrcdiaeolatum, 



Lower eyelid scaly : 18 or 20 scales round [p. 328. 



the body 138. quadrivittatum, 



[p. 329. 



B. Limbs weak ; prasfrontals minute or absent. 



1. Limbs pentadactyle. 



Ear covered with scales : dorsal scales 



smooth 139. scutirostrum, p. 330, 



Ear covered with scales : dorsal scales 



pluricarinate 140. maria;, p. 330. 



Ear-opening distinct, minute 141. gracile, p. 331, 



2, Limbs tridactyle 142, (cquale, p, 332. 



X, Limbs short or rudimentary. Lower eyelid with a transparent 

 disk. Ear distinct, minute, Xo supranasals, Prasfrontals 

 very small and widely separated, or absent. Frontal broader 

 than the supraocular region, {Bhodona, Gray.) 



A, Limbs, both pairs i:)reseut, pentadactyle. 



20 scales round the body ; frontal as long 

 as frontoparietals and interparietal 

 together 143. microtis, p. 333. 



22 or 24 scales round the body ; frontal 

 longer than frontoparietals and inter- 

 parietal together 144. hougainvillii, p. 333. 



