SPIROTRICHA, OLIGOTRICHA 



821 



P. multivesiculatum (D. and Fedorowa) (Fig. 350, a). 120-190/* by 

 78-140/*; in cattle and sheep. MacLennan (1934) found that the 

 skeletal plates are made up of small, roughly prismatic blocks of 

 glycogen, each with a central granule. 



Genus Elytroplastron Kofoid and MacLennan. 2 zones at anterior 

 end, 2 skeletal plates beneath right surface, a small plate beneath 



Fig. 350. a, Polyplastron multivesiculatum, X360 (Dogiel); b, Ely- 

 troplastron hegneri, X340 (Dogiel); c, Ostracodinium dentatum, X440 

 (Dogiel); d, Enoploplastron triloricatum, X370 (Dogiel); e, Epidinium 

 caudatum, X340 (Becker and Talbott); f, E. ecaudatum, X340 (Becker 

 and Talbott); g, Epiplastron africanum, X300 (Dogiel). 



ventral surface, and a long plate below left side; pellicle and ecto- 

 plasm thick; conspicuous fibrils beneath dorsal-right side. One 

 species. 



E. hegneri (Becker and Talbott) (Fig. 350, b). 110-160/* by 67-97/*; 

 in cattle, sheep, Buffelus bubalus and Bos indicus (Becker, 1933). 



Genus Ostracodinium Dogiel. 2 zones at anterior end; broad skele- 

 tal plate beneath right side ; 2-6 contractile vacuoles in a dorsal row ; 



