132 



BOYS AND GIRLS IN BIOLOGY. 

 Fig. 116. 



Tail-fin, or 

 Telson, 



Nerve-bunch, 



or Ganglion. 



Intestine. 



Aorta, 



Heart, 



Blood-tubes 

 (Arteries). — © 



Gate-keeper 

 (Pylorus). 



Meat-pipe 

 '(Esophagus).. 



Mouth 



Green Gland ^ 



Eye 



Beak - 



Little Swim- 

 mers, or 



SWLMMERETS. 



Great Pincer. 



