AMOEBAEA 211 



periphery. At the time of division, the endosome disintegrates 

 and chromosomes and spindle fibers appear. There are no so- 

 called polar caps during division as are found in Vahlkampfia. 



Hartmannella hyalina (Dangeard) (Fig. 82, c, d). Easily 

 cultivated from old feces of man and animals and also from 

 water. More or less rounded body measures less than 20 

 microns in diameter. A single nucleus and a contractile vacuole. 

 Binary fission. The spherical cyst measures 10 to 15 microns 

 in diameter, covered with a smooth inner and a much wrinkled 

 outer wall. 



Genus Sappinia Dangeard. With two closely associated 

 nuclei. ... -." 



Sappinia diploidea (Hartmann and Nagler). -'"Coprozoic in 

 the feces of widely different animals. The pseudopodia are 

 short and broad, and few. The highly vacuolated endoplasm 

 c&iijtains two nuclei, food vacuoles, and a contractile vacuole. 

 A wrinkled surface is sometimes, noticed. The nuclei divide 

 simultaneously. During encysthient, two mdividuals come, 

 together and secrete a common cyst wall. The two nuclei fuse 

 so that each individual possesses a single nucleus; finally the 

 cytoplasmic masses of the two individuals.*inite into one. Each 

 nucleus gives off reduction bodies which d^egenerate. Two 

 nuclei now come in contact without fusion, thus a binucleate 

 cyst is formed. After leaving' the cyst-wall, the binucleate 

 amoeba grows and multipHes (Hartmann and Nagler),.*, 



Family 3 Endamoebidae Calkins^ 



^ 



Endoparasitic amoebae wtth a wide zoological distribution. 



mostly witbeiri 



. . Mitiltiplication 



... r . .19}£J 89Junim y:rn'j7/'j «d-jo;ji>; oniiZc 



by bmary fission. 



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