104 Transactions of the Boyal Society of South Africa. 
Crests of head are similar to those of ventralis tyjncus. The upper surface 
of head between and somewhat in front of the eyes is concave, but there is 
no deep depression such as occurs in C. immilus, Daud., just anterior to 
the eyes. Scales on back and sides granular, intermixed with rather small 
subconical tubercles which become flattened in the region of the groin ; the 
tubercles are more or less regularly arranged in interrupted longitudinal 
rows ; the smallest tubercles are those which occur on the back, the 
largest occurring on the flanks. A dorsal crest as in ventralis typicios : 
ventral scales practically equal (in vejitralis typicus they are often very 
unequal). Throat with ratber small subconical tubercles; gular crest 
composed of elongated scaly lobules, none of which are as broad as 
long, the anterior ones largest (in ventralis typicits the anterior gular 
lobes are considerably broader than long and overlap each other ante- 
riorly). 
Tail shorter than head and body, the lateral caudal tubercles slightly 
smaller than the larger tubercles on the flanks. 
Notes on Co-types. — In 3 specimens, 2 from the same locality, and 1 
from Jansenville, the tubercles occupying two middle rows on the flanks 
are larger than those on the rest of the body ; in 2 specimens (1713) and 
(1732) all the gular lobes are sharply pointed. 
The example from Jansenville shows an approach to the G. ventralis 
typicus condition, in that the anterior gular lobes overlap and the first lobe 
is only very slightly longer than broad, all the other larger lobes being 
however considerably longer than broad. We may mention that a 
Beaufort West specimen has been referred by Mr. Boulenger to C. 
pumilus (Ann. S. Af. Mus., v., p. 492). It may be doubted, however, if 
two species actually occur in that locality. 
