WONDERFUL TEKTH AND TONGUES 237 



bayonets, needles, spikes, &c., while many are 

 barlsecl alono' their trenchant edges. In iMg, i ^8 

 a beautiful example is o-iven, showing numerous 

 rows ot \-arious kinds of teeth on the same palate. 



Palate of snaii show ini;- different foi nis of tei-th 



Here we leave the snail family, and take up one 

 of the slug species. The illustration in Fig. 159 

 is from a slug of carnivorous habits, which feeds 

 on the common earth-worms. Worms, being tough 

 and trickv, require a somewhat different digestive 

 apparatus. On looking at our illustration, it will 

 be seen that the teeth are long, slender, barbed 



