8. LYGOSOMA. 223 
VIII. Limbs very short, with less than five digits. Lower eyelid 
with an undivided transparent disk. Ear covered with scales. 
No supranasals. Prefrontals well developed. Frontal not 
broader than the supraocular region. (Hemiergis, Wagl.) 
Limbs tetradactyle........ 0... 0.005. 134. peronii, p. 326. 
Limbs tridactyle..............0.00.. 135. decresiense, p. 327. 
Limbs didactyle.................... 136. quadrilineatum, 
[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. Preefrontals (in the species with short limbs) 
minute or absent. Frontal not broader than the supraocular 
region. (Siaphos, Gray.) 
A. Limbs overlapping when adpressed; prefrontals well de- 
veloped. 
Lower eyelid with an undivided trans- 
parent disk ; 22 scales round the body 137. infralineolatum, 
Lower eyelid scaly ; 18 or 20 scales round [p. 328. 
he body o-s55 say doencaie ge eae 138. quadrivitiatum, 
[p. 329. 
B. Limbs weak ; prefrontals minute or absent. 
1. Limbs pentadactyle. 
Ear covered with scales; dorsal scales 
smooth, . cs. avevsees esis seeaerat 139. scutirostrum, p. 330. 
Ear covered with scales; dorsal scales 
pluricarinate 0.6.0... cece eee eee 140. marie, p. 330. 
Ear-opening distinct, minute ........ 141. gracile, p. 331. 
2. Limbs tridactyle ............ 142. wquale, p. 332. 
X. Limbs short or rudimentary. Lower eyelid with a transparent 
disk. Ear distinct, minute. No supranasals. Prefrontals 
very small and widely separated, or absent. Frontal broader 
than the supraocular region. (Rhodona, Gray.) 
A. Limbs, both pairs present, pentadactyle. 
20 scales round the body ; frontal as long 
as frontoparietals and interparietal 
together .... 0... cece eee tee eee 148. microtis, p. 333, 
22 or 24 scales round the body; frontal 
longer than frontoparietals and inter- 
parietal together ........... wees 14d. bougainvillii, p. 333, 
