96 
CHAPTER VIII. 
THE ADDER—(Continued. 
ANATOMY. 
ANATOMICAL POINTS — PLATES AND SCALES — JAWS POISON- 
FANG — WINDPIPE — GULLET — STOMACH — HEART, LUNGS, 
AND LIVER. 
Anatomy.—Except that the adder is a poisonous 
serpent, all the nevative characteristics of the Ophidia, 
which were noted under the anatomy of the ring 
snake, are again to be remarked in the adder. But 
there are some positive differences to be noted, and 
some points common to both these snakes not referred 
to previously. 
Plates and scales.—The plates on the head in 
this species are more numerous than in the ring snake, 
and have quite a different arrangement. They are 
also smaller, with the exception of one large plate 
between the eyes, often the only light-coloured spot 
on the top of the head. The position of this plate 
is shown in two of the drawings of the V-shaped 
