GUIDE TO THE STUDY OF 

 ANIMAL PARASITES 



CHAPTER I 



THE MAJOR GROUPS AND DISTRIBUTION OF ANIMAL 



PARASITES AS ILLUSTRATED BY THE ANIMAL 



PARASITES OF THE FROG 



TECHNICAL SUGGESTIONS 



At the outset of the work, when the general principles of animal 

 parasitism are being discussed in the lectures, two laboratory periods 

 may be devoted profitably to a general survey of the parasites of the 

 frog. For these practicums freshly killed frogs of any species may be 

 used. It is not necessary that they be large enough for ordinary 

 anatomical work. When feasible it is advantageous to have them 

 from different habitats and, preferably, recently caught. Shortly 

 before the class period they should be chloroformed. 



For purpose of future study and statistics it is well at the close of 

 the period to collect the specimens found and to preserve them, with 

 accurate data as to sources, according to the directions given in the 

 Appendix. If time and facilities permit, it is still better to have this 

 done by the students themselves. 



SYSTEMATIC REVIEW 



Before undertaking the practical work outlined, the student 

 should review the characteristics of the animal phyla and classes 

 with which our course will be chiefly concerned. 



Phylum PROTOZOA. — Animals in which the entire body 

 consists of a single cell which, however, may possess a highly 

 complicated structure. Four classes are usually recognized. 



Class RHIZOPODA.— Protozoa in which the motile organs 

 are pseudopodia. 



Class MASTIGOPHORA — Forms possessing an outer cell 

 integument and flagella as motile organs. 



Class SPOROZOA — Parasitic Protozoa typically without 

 organs of locomotion; reproduce by spore formation. Group 

 not a natural one. 



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