LABORATORY WORK, XVIII 363 



OBSERVATIONS ON THE LIVING ANIMAL 



1. How are the movements of appendages and tail correlated in lo- 

 comotion (a) on land, (6) in water ? Diagrams. 



2. Observe the instincts of the animal when placed in a box of 

 earth Q damp and ^ dry) lighted on one side from the window arid 

 strewn with leaves and stones. 



TOPICS FOR FURTHER STUDY 



1. Habitat and food of the species studied. 2. Distribution of 

 Amphibia. 3. Allied organisms in the United States: Desmogna- 

 thus, Plethodon, Amblystoma, Amphiuma, Necturus, Siren ; their 

 distribution and habitats. 4. Experiments upon changing Axolotl 

 into Amblystoma. 5. Egg-laying of Urodela and general form- 

 changes accompanying development. 



XVIII. LIZARD (Anolis carolinensis} 



This may be replaced by any other species. Where live lizards 

 cannot be easily obtained, substitute a snake or tortoise and make 

 appropriate changes in the following outline. 



DRAWINGS 



1. Entire animal, dorsal view, x 1 to 3. 



2. Dorsal view of head, showing scales, especially the parietal scale, 

 x 3. 



3. Left side of head ; mouth open, tongue exposed, x 3. 



4. Left fore foot, dorsal aspect, x 3. 



5. Left hind foot, palmar aspect, x 3. 



6. Outline of front lateral teeth, x 10. 



7. Outline of scales on ventral side at base of tail, x 10. 



8. Outline of scales on back, x 10. 



QUESTIONS ON EXTERNAL ANATOMY 



1. Which is the thumb side of the fore foot ? Why ? Of the hind 

 foot? Why? 



2. What is the function of the structures on the pads of the toes ? 



