134 



BOYS AND GIRLS IN BIOLOGY. 



Fig. 117. 



T-shaped Frame. 



| Tooth. 



1 



r 



The Lobster's Mill. 



mould of this T-shaped mill ; it is sometimes called 

 " the lady in her chair," because some one fancied it 



Ftg. 118. 



8 B I 



The Mill and its Muscles, 



Tooth.. 



