106 THE VIVARIUM. 
this genus it is not seen at all. The upper parts are a reddish- 
grey, spotted with black and white. On each side there are two 
or three parallel streaks of yellowish-white ; the lower surfaces 
are white. This Reptile is also found in the south of France and 
Portugal. 
I cannot give the usual market prices of the last few Lizards 
which have been described. Their value in England, of course, 
depends upon the numbers imported. They may be treated in 
confinement as already suggested: and any of the Lacertw and 
their near relatives which have not been mentioned for want of 
space shall be cared for in the same way. 
Lord Derby’s or the Derbian Lizard (Zonurus derbianus, 
Gray; Z. giganteus Boulenger).— To an observer who is not 
versed in reptilian matters this strange-looking creature has a 
little resemblance to the well-known Horned Lizard (Phryno- 
soma cornutum), often called the ‘‘Calfornian Toad.” The 
arrangement of its scales is ring-like, or belt-like, hence the 
generic name. This Reptile occasionally reaches a length of 
15in. It, and the other members of its family, have a short 
and hairy tongue, slightly nicked at the tip and hardly pro- 
tractile. The teeth are pleurodont and very small; there are 
none on the palate. The head-shields of Z. derbianus are very 
rough ; the dorsal scales are large and strongly keeled, ending in 
asharp point. The scales of the body are arranged in about 
twenty-four belts. The ventral scales are also large and tiled, 
and those of the neck, sides, and tail end in conical spines. The 
limbs possess large, tiled, keeled scales ending in a spines. Of 
this Lizard Mr. Boulenger says that the ‘‘upper and lateral 
caudal scales are very large, strongly spinose, the lateral spines 
largest and horizontal; lower caudal scales long, narrow, penta- 
gonal, smooth. Yellowish, back clouded with brown; upper 
surface of'head brown. The young light yellowish, marbled and 
cross-barred with blackish-brown ; the spines not at all developed, 
and all the scales more strongly imbricate.’”” The animal is a 
native of South Africa. 
This Lizard should be kept in a large case according to the 
size of the animal. In winter and during early spring and late 
autumn, it must be supplied with artificial heat, the temperature 
