ROCK SNAKE, 
The RockSnake of India and 
Ceylon (P. molurus) is another 
species to which the name of 
Boa Constrictor has been given. 
It has the two pairs of front 
upper, and three hind lower 
labial shields pitted, and the 
frontal plates double. Of this 
gigantic Serpent several speci- 
mens are generally to be seen 
in the Zoological Gardens. 
Ill.—Hortulia, having the 
upper and lower labial shields 
deeply pitted; muzzle and fore- 
head with symmetrical shield ; 
nostrils lateral. They are natives 
of Africa, and three species are 
known, namely, the Natal Rock 
Snake, having the lower labial 
shields deeply pitted, the muzzle 
and forehead with symmetrical 
shields, the nostrils lateral; the 
Guinea Rock or Fetish Snake 
(ZZ. Sebe), closely resembling the 
last in many structural points; 
and the Royal Rock Snake 
(ZZ. regia), having the four pairs 
of the upper front labials pitted, 
the upper ocular plate single, 
and lower labial shields four in 
number and broad. 
The Royal Rock Snake in- 
habits Western Africa. It is 
black in colour, marked on the 
middle of the back with a series 
of oblong white spots, the sides 
being marked by another series 
of large white spots, with one 
or two black spots in the upper 
part; the head black, with a 
streak over the nostrils and the 
top of the eyes. 
Fig, 13.—Natal Rock Snake, 
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