45 2 ZOOLOGY. 



performing the following functions and the organs used 

 therein, in all the principal animal phyla. 



1. The capture of food: the method; the organs devoted to 

 it ; and the relation of these to the nature of the food used. 



2. Digestion; physical and chemical. 



3. Circulation, as pertaining both to the nature of the circu- 

 lating fluid and to the organs moving it; the relation of the 

 whole process to the organs and function of digestion and 

 respiration in the types chosen. 



4. Respiration : the medium containing the oxygen, and the 

 contrivances for securing it. 



5. Excretion : note and classify the chief modes of elimin- 

 ating waste materials observed in the animal phyla. 



6. The body cavity (ccelom) in relation to digestion, cir- 

 culation and excretion. 



7. Physical support and protection (skeletal structures) : 

 their position, structure, and mode of formation. 



8. Motion and locomotion : degree of each ; relation of the 

 muscular or contractile elements to the skeletal. The medium 

 used in locomotion ; the principal special devices in each group 

 for the solution of the problems presented by the medium. 



9. Sensitiveness : the kinds of stimuli to which the organ- 

 isms in the various groups react; the differences in the differ- 

 ent phyla in each of the various classes of sense organs, as to 

 structure, position, and manner of action ; the number, position 

 and perfection of the nerve centres ; and the relation of the 

 nerve centres to the sense organs and to the muscles. 



10. Reproduction. The various methods, and the special 

 ends accomplished by each; rate; number of offspring; paren- 

 tal care; sex dimorphism; alternation of generation; partheno- 

 genesis. 



III. Ecology and Adaptations to the Environment. Com- 

 pare the animal groups from the following points of view. 



1. General habitat: aquatic, fresh or salt water; terrestrial: 

 aerial. 



2. Migration or other special means of effecting distribution 

 from the point of origin. 



