and by 'saw-toothed' we mean

such animals as interlock the sharp-pointed teeth in one jaw between
the sharp-pointed ones in the other. No animal is there that possesses
both tusks and horns, nor yet do either of these structures exist in
any animal possessed of 'saw-teeth'. The front teeth are usually
sharp, and the back ones blunt. The seal is saw-toothed throughout,
inasmuch as he is a sort of link with the class of fishes; for
fishes are almost all saw-toothed.