The Head Shields of a Snake.
r, rostral shield; ff, anterior and posterior frontal; v, interparietal; s, supraocular; o, parietal; nn', nasal; l, loreal; a, preocular; p, postocular; uu, upper labial; tt', temporal; m, mental; **, lower labial; cc, chin-shields.—After Günther.
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Externally the Snake is covered by small overlapping scales on the upper parts and by broad plates on the under surface. The head is covered mainly by shields, each of which has a definite name, but for the purposes of this book it is not necessary to enter upon a tedious recital of these terms, beyond giving them for reference under the diagram of a Snake's head.
Skeleton of Snake.
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