CiU Covtr 

 Cill ChamLer 

 (jill Opening ~ 



^i::^ 



CillA^cti 

 Cill Cleft 

 Cill Fildment 



BONY FISH 



Cill Openinp[Z^^ 



^— C/// Cleff 

 ^ — Cill tiUmeni 



SHARK 

 Figure 21. GILLS 



