Beviscd List of South African Beptilcs and Batrachians. 467 



Four Genera. 

 I. Limbs well developed. 



A. Back with bony plates underlying the horny scales, which 



are large Zonurus. 



B. Back without bony plates, dorsal scales small. 



Dorsal lepidosis heterogeneous Pseudocordylus. 



Dorsal lepidosis uniformly granular Platysaurus. 



II. Limbs rudimentary ; body serpentiform, covered with whorls 



of lanceolate, keeled scales . . . . • • Cluuiuesaura. 



1. ZONURUS. 

 MeiTem, Tent. Syst. Amph. p. 57 ; Bouleng. Cat. Liz. ii. p. 252. 



Synopsis of the South African Species. 



I. Frontonasal in contact with the rostral, separating the 

 nasals. 

 A transverse series of 4 large occipital spines ; 23 to 25 trans- 

 verse rows of scales from occiput to base of tail Z. rjiganteus. 



A transverse series of 6 small occipital spines ; 40 transverse 



rows of scales from occiput to base of tail Z. warreni. 



II. Frontonasal separated from the rostral by the nasals or the 

 supranasals . 



A. No supranasal, nostril in a large nasal, or between a large 

 nasal and a small j)ostnasal ; lower eyelid entirely scaly. 



1. Flanks with large scales similar to or a little smaller 

 than the dorsals. 



a. Ventral scales smooth ; frontonasal present. 



n. Less than 20 rows of scales from occiput to 

 base of tail. 

 Nasal strongly swollen, hemispherical, pierced in the centre . . Z. cataphractus. 



Nasal not swollen Z. macropholis. 



iS. More than 20 rows of scales from occiput to 

 base of tail. 



Lateral scales as large as dorsals Z. cordylus. 



Lateral scales smaller than dorsals Z. jonesii. 



b. Ventral scales keeled ; frontonasal absent. . .. Z. tropidotj aster 



2. Flanks covered with granular scales; only 8 longi- 

 tudinal rows of ventral scales Z. capensis. 



B. A supranasal shield, distinct from the very small nasal; 

 lower eyelid with a more or less transparent disk in the 

 middle ; more than 30 rows of scales from occiput to 

 base of tail. 



Anterior gular scales tiat, moderate Z. poly z onus. 



Anterior gular scales almost granular Z. pustulatus. 



1. Zonurus giganteus, Smith, 111., Eept. pis. xxv. and xxxvi. ; 

 Bouleng., t.c, p. 253. 

 Cape Colony, Orange River Colony, Transvaal. 

 Cape Colony: Colesberg (Ortlepp). 



