IN THE LOWER ANIMALS, ETC. 



227 



Fig. 2^.—J)olphm. 



Fig. 'i^.—Boa Constrictor. 



Fig. m.—])off-Fhh. 



The teeth of the invertebrate classes present an 

 endless variety of remarkable contrivances, ex- 

 actly adapted to the particular requirements of 

 each species. 



Did time permit, we might notice the curiously 

 formed teeth and jaws of the sea-urchin, among 

 the radiates (one of the lowest types of animal 

 life), or the diversified forms presented by the 

 horny teeth of insects. The gastric teeth of the 



Q 2 



