WONDERFUL TEETH AND TONGUES 237 



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

 barbed along their trenchant edges. In Fig. 158 

 a beautiful example is given, showing numerous 

 rows of various kinds of teeth on the same palate. 



it forms of teeth 



Here we leave the snail family, and take up one 

 of the slug species. The illustration in Fig. 1 59 

 is from a slug of carnivorous habits, which feeds 

 on the common earth-worms. Worms, being tough 

 and tricky, require a somewhat different digestive 

 apparatus. On looking at our illustration, it will 

 be seen that the teeth are long, slender, barbed 



