20 ELEMENTS OF COMPARATIVE ZOOLOGY. 

 COMPARISONS. 



Divide a page of your note-book by a vertical line; label 

 one column Bony Fish and the other Dogfish, and in each 

 write the answers to the following questions, numbering 

 them as they are here : 



(1) What kind of scales? (2) Where is the mouth? 

 (3) What is the shape of the caudal fin ? (4) How do the 

 gills differ ? (5) Where are the nostrils ? (6) What is the 

 character of the hard parts ? (7) Is there a spiral valve in 

 the intestine ? (8) What parts occur in the heart? (9) Is 

 there a swim-bladder ? (10) Is there an operculum ? 



