THE SPOROZOA 



279 



body is divisible into two distinct regions, a denser external 

 ectoplasm, clear and very finely granular, enclosing a more fluid 

 endoplasm, which is opaque and coarsely granular (Figs. 83 and 84). 



FIG. 82. 



Section of the wall of the urinary bladder of a tench, showing Myzobolus ellipsoides, Thel. 

 (myx), occurring in the condition of diffuse infiltration between the bundles of connective tissue 

 (c.<). (From Wasielewski, after Thelohan.) 



The ectoplasm is the seat of movement, and the pseudopodia take 

 origin from it, but it also has a protective function, well seen in the 

 forms inhabiting bile or urine, which disintegrate if the ectoplasm 



ect 



V - 



Fio. 83. 



Trophozoite of Chloromyxum leydigi, 

 Ming. (par. Scyllium, Raia, etc.), in a 

 condition of activity, ect, ectoplasm ; 

 p, pseudopodia ; end, endoplasm ; 

 y, yellow globules in the endoplasm ; 

 sp, spores, each with four pole capsules. 

 (After Thelohan, x 525.) 



Fio. 84. 



Trophozoite of Sphaerospora divergens, Thel. (par. 

 Blennius and Crenilabrus). Letters as in Fig. 83. 

 (After Thelohan, from Wasielewski, x 750.) 



be damaged. The endoplasm, besides vacuoles, granules of various 

 kinds, and sometimes crystals, contains the nuclei, and spores in 

 ' all stages of development. 



