CHAPTER XXX 



SPOROZOA IN GENERAL 



By 



Robert Hegner 



The Johns Hopkins University School of Hygiene and 



PubHc Health 



INTRODUCTION 



It is the object of this chapter to outline in brief the class 

 SPOROZOA and to indicate in particular where material can most 

 easily be obtained for study and investigation. Information v^ith 

 respect to coccidiosis in birds and mammals will be found in 

 Chapter XXXI ; malaria in general and certain phases of the 

 study of malaria are treated in Chapters XXXIV to XXXIX in- 

 clusive and details of the study of myxosporidia, and micro- 

 SPORiDiA and are likewise given special treatment in Chapters 

 XXXII and XXXIII. 



The SPOROZOA are treated in all text and reference books on 

 protozoology. Those that occur in man and certain lower animals 

 are discussed in Hegner and Taliaferro's Human Protozoology, 

 pp. 266-377. Wenyon in his Protozoology devotes Volume II, 

 pp. 779-1152, to this class and Calkins in his Biology of the 

 Protozoa presents a brief morphological and taxonomic discussion 

 of the SPOROZOA on pp. 415-462. The reader is referred to these 

 books for descriptions and classification of this group. It will be 

 found that each author uses a different classification. In this 

 chapter the classification employed is much abbreviated for the 

 sake of simplicity. Two sub-classes and six orders are recognized 

 as follows: 



Subclass I. TELOSPORIDIA 



Order i. gregarinida 

 Order 2. coccidia 

 Order 3. HiEMOSPORiDiA 

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