Phylum Arthropoda 493 



CHELIPEO 



ANTENNULE 

 ANTENNA 

 ROSTRUM 

 COMPOUND EYE 



O 



< 

 X 



a. 

 Ill 

 o 



CERVICAL SUTURE 



WALKING LEGS 



BRANCHIOSTEGITE 



SIXTH SWIMMERET 

 ■TELSON 



z 

 111 



z 

 o 



a 

 a 

 < 



Fig. 161. — The crayfish, Cambariis, dorsal view. (From Parker and Clarke: 

 An Introduction to Animal Biology.) 



