IV PREFACE. 



The twenty-one types of animal life herein treated give the student 

 a brief general survey of the field from Protozoan to Vertebrate. Simi- 

 lar treatment is accorded each type. It will be noted that the zoological 

 position of each animal is given (Parker and HaswelPs classification), 

 that its habitat receives attention, and that there are hints on collecting 

 the material for class study. Details of structure that are very obscure 

 are either omitted, or, if essential, attention is called to them without 

 any attempt at demonstration. 



The author is constrained to believe that by reason of their special 

 advantages and a simple and rational treatment of the subject in 

 general, these Notes will commend themselves to teachers of zoology. 



At this point I desire to thank Dr. C. E. McClung of Kansas Uni- 

 versity for his kindness in reviewing the manuscript and giving helpful 

 suggestions. 



THEO. H. SCHEFFER. 



MANHATTAN, KANS. 



PREFACE TO SECOND EDITION. 



The favorable reception accorded these Notes by teachers of zoology 

 has necessitated and warranted the printing of a second edition. This 

 edition includes notes on three more types of animal life and is bound 

 in a still more convenient form than was the first edition. 



THEO. H. SCHEFFER. 



MANHATTAN, KANS. 

 October, 1908. 



