RESPIRATION. 



12. Gills of (a) a fish and (6) a young tadpole. 



13. Respiratory movements. Observe the nature of the respiratory movements of 



the following animals : 



(a) Fresh-water annelids ; 



(6) Aquatic dipteran larva in its tube ; 



(c) Mosquito larvae ; 



(d) Mosquito pupae ; 



(e) A tadpole with internal gills ; 

 (/) A frog. 



