BOOK XI. Lxi. 160-LXI1. 163 



LXI. There are three kinds of teeth — serrated or neteeth. 

 continuous or projecting: serrated teeth closing to- 

 gether like the teeth of a comb, so as not to be Avorn 

 away by direct colUsion, as in snakes, fishes and dogs ; 

 continuous, as in man and the horse ; projecting, as in 

 the boar, hippopotamus and elephant. Of continu- 

 ous teeth those that separate the food (incisors), 

 are called the broad or sharp teeth, those 

 that masticate it double teeth, and those be- 

 tween these dog-teeth. The latter are longest in 

 creatures with serrated teeth. Continuous teeth 

 are either in both jaws, as with the horse, or else there 

 are no front teeth in the upper jaw, as with oxen and 

 sheep and all the ruminants. The goat has no upper 

 teeth except the pair in front. Species having 

 serrated teeth have no projecting teeth, and a feraale 

 rarely has them, and when she has them does not use 

 them ; consequently though boars gore, sows bite. 

 No species with horns has projecting teeth, but all 

 have curved ones ; all the other species have soUd 

 teeth. AU kinds of fish have serrated teeth except 

 the parrot-fish — tliis is the only aquatic species that 

 has level teeth. Many of them however have teeth on 

 the tongue and aU over the mouth, so as to soften by 

 means of a muUipUcity of wounds objects that they 

 are unable to reduce by mastication. Many also 

 have teeth on the palate [and also on the tail,]" and 

 also turned further into the mouth, so as to prevent 

 morsels of food from faUing out, as they have no 

 apparatus for retaining it. 



LXII. The asp and serpent have similar te.Qt\\, Theteethof 

 but two extremely long ones on the right and left ^p^^^ 

 side of the upper jaw, perforated by a slender tube 

 Uke the stings of the scorpion, which inject poison. 



voL. m. S 533 



