COMPARISONS. 



Prepare a sheet of paper with two columns as before, 

 one for Fishes and the other for the Frog and Tadpole, and 

 give answers to the following questions: 



(1) Is the skin naked or scaly? 



(2) What kind of appendages occur? 



(3) Is the pelvic girdle united to the back-bone? 



(4) Is there a Eustachian tube? 



(5) What differences are there in the heart? 



(6) What are the organs of respiration? 



(7) Do the nostrils communicate with the mouth? 



(8) Differences between transverse processes and ribs? 



(9) Is a sternum present? 



Read the section on Amphibia (pp. 336 to 341) and 

 compare this with the account of the fishes already studied. 



On another sheet rule two columns for Fishes and 

 Amphibia and answer the following questions, using your 

 notes and the sections which you have read to aid in 

 certain points: 



(1) Is the blood cold or warm? 



(2) Are median fins present in young or adult? 



(3) Are gills present in young or adult? 



(4) Are lateral-line organs ever present? 



43 



