276 Animal Biology 



attack of fever every seventy-two hours; Plasmodium vivax, which causes human 

 malaria (tertian type) with an attack every forty-eight hours; Plasmodium fal- 

 ciparum, which causes human malaria (subtertian or estivo-autumnal type) with 

 a daily attack, or more or less constant fever; and Babesia bigemina (Fig. 267), 

 which causes Texas fever of cattle. Sporozoan diseases are considered in greater 

 detail in other chapters. 



Class 4 — Infusoria (in fu -so' ri a) (L. infusus, crowded or poured into). — 

 These Protozoa, comm^only called "infusorians," are very numerous in fresh water 



s — Flagell\ani 



Stigma^ 



^Contractile 

 vacpole — 



Reservoir— 



"Pelllcle- 



^■Nucleus 



Chromatophore— 



Pyrenold 



Phar:^:c 







"Plagelltun— -^— 



Pharynx 



Pyrenold IKXi 



X^hromatophore ''^^ 



Nucleus — 



Contractlle-ife'* 

 vacuole 



H 



o , :,--• Nucleus 



• •• ■ 



<iM^^ Flagellum 



Oontractlle 

 vacuole 





Fig. 76. — Representative protozoa of the class Mastigophora. A, Chilomonas 

 Paramecium; B, Ceratium hirundinella ; C, Chlamydomonas monadina; D, Euglena 

 viridis; E, Phacus longicaudus; F, Monosiga robusta; G, Trachelomonas hispida; 

 H, Peranema trichophorum; I, Mastigamoeba aspera; ], Bodo caudatus; K, 

 Cercomonas longicauda; L, Tetramitus rostratus. (All enlarged and somewhat 

 diagrammatic. ) 



