FEOG 209 



What are the main points of resemblance? 

 What are the principal differences? How do 

 you explain the latter ? Do you find a hallux 

 or great toe ? In what respects does the skin 

 of the thigh differ from that on other parts of 

 the body ? 

 Make diagrams illustrating the main features of the 



external anatomy. 



In what respects, if any, do the appendages of the 



frog resemble those of the lobster and the locust ? 



Internal Anatomy. 

 A. The skeleton. 



Study the articulated skeleton prepared in 

 Wickersheimer's fluid, using for comparison the 

 individual bones of the other skeleton. Note 

 the axial skeleton, consisting of the skull 

 and vertebral column or "backbone," and the 

 appendicular skeleton, composed of the limbs, 

 which are more or less closely attached to the 

 axis by means of the limb-girdles ; the anterior 

 being the pectoral-girdle or shoulder-girdle, 

 the posterior the pelvic-girdle or hip-girdle. 



a. The vertebral column. — What is its general ap- 

 pearance ? Is it a single bone ? If not, why is it 

 called the " backbone " ? Of how many parts 

 does it consist ? Is the vertebral column hollow 

 or solid ? Notice that the entire column may be 

 divided into two regions, an anterior and a poste- 

 rior, the latter formed of the urostyle. What 

 is the shape of the urostyle ? Structure ? How 

 does its length compare with that of the anterior 

 portion of the column? Is it a single piece, or 

 does it consist of segments? To what is its an- 

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