COMPARISONS. 31 



(5) Do the nostrils connect with the mouth or throat? 



(6) What structures are used for respiration? 



(7) Where does the animal get its oxygen? 



(8) How many auricles and how many ventricles to 

 the heart? 



Read all the matter upon fishes (pp. 317 to 336) , includ- 

 ing that already read, and decide to what order the bony-fish 

 you dissected belongs. 



