The difference in formation between s and s is that the former is dental or alveolar, the latter is produced farther back and has .at least two varieties.
The sound was that of the unvoiced dental stop. The English t, however, is not dental but alveolar, being pronounced, as d also, not by putting the tongue against the teeth but against their sockets.
This difference is marked in the phonetic differentiation of the dental and the alveolar t by writing them respectively t and t.
The alveolar sound is frequent also in the languages of India, which possess both this and the dental sound.
Associated with this is the strength and sharpness of the lower jaw, the prominence and anterior pcsition of the masseteric ridge, and the depth of the ramus from the alveolar line to the angle.
The latter expand in front, and are curved downwards to form the semicircular alveolar border which supports the large incisor teeth.
The condyle is greatly elevated above the alveolar border; its articular surface is very wide transversely, and narrow and convex from before backwards.
The horizontal ramus, long, straight, and compressed, gradually narrows towards the symphysis, where it expands laterally to form with the ankylosed opposite ramus the wide, semicircular, shallow alveolar border for the incisor teeth.
With alveolar teeth.