820 PROTOZOOLOGY 



same level; without skeletal plates; macro-nucleus beneath right side, 

 its anterior third bent ventrally at an angle of 30°-90°; 2 contractile 

 vacuoles; in cattle, antelope, Camelus dromedarius, reindeer, goat. 

 Numerous species (Kofoid and MacLennan, 1932). 



D. dentatum (Stein) (Fig. 349, b). 65-82/* by 40-50/*; in cattle 

 (including Bos indicus). 



Genus Eremoplastron Kofoid and MacLennan. Adoral and dorsal 

 zones at anterior end; a single narrow skeletal plate beneath right 

 surface; triangular or rod-like macronucleus, anterior end of which 

 is often bent ventrally; 2 contractile vacuoles; in cattle, antelope, 

 sheep, reindeer. Numerous species (Kofoid and MacLennan, 1932). 



E. bovis (Dogiel) (Fig. 349, c). 52-100/x by 34-50/*; in cattle and 

 sheep. 



Genus Eudiplodinium Dogiel. Adoral and dorsal zones at anterior 

 end; a single, narrow, skeletal plate beneath right surface; rod-like 

 macronucleus with its anterior end enlarged to form a hook opening 

 dorsally; pellicle and ectoplasm thick; 2 contractile vacuoles with 

 heavy membranes and prominent pores; in cattle. Species (Kofoid 

 and MacLennan, 1932). 



E. maggii (Fiorentini) (Fig. 349, d). 104-255/* by 63-1 70m; in cat- 

 tle, sheep and reindeer. 



Genus Diploplastron Kofoid and MacLennan. Adoral and dorsal 

 zones at anterior end; 2 skeletal plates beneath right surface; macro- 

 nucleus narrow; rod-like; 2 contractile vacuoles below dorsal surface, 

 separated from macronucleus. One species (Kofoid and MacLennan, 

 1932). 



D. affine (Dogiel and Fedorowa) (Fig. 349, e). 88-120/x by 47-65/*; 

 in the stomach of cattle, sheep, and goat. 



Genus Metadinium Awerinzew and Mutafowa. Adoral and dor- 

 sal zones at anterior end; 2 skeletal plates beneath right surface 

 sometimes fused posteriorly; macronucleus with 2-3 dorsal lobes; 

 2 contractile vacuoles; pellicle and ectoplasm thick; conspicuous 

 oesophageal fibrils beneath dorsal and right sides; in the stomach of 

 cattle, sheep, goat, and reindeer (Awerinzew and Mutafowa, 1914). 



M. medium A. and M. (Fig. 349,/). 180-272/* by 111-175/*; in cat- 

 tle. 



Genus Polyplastron Dogiel. Adoral and dorsal zones at anterior 

 end; 2 skeletal plates beneath right surface, separate or fused; 3 

 longitudinal plates beneath left surface, with anterior ends con- 

 nected by cross bars; contractile vacuoles beneath dorsal surface in a 

 longitudinal row, also with additional vacuoles; in the stomach of 

 cattle and sheep. Species (Kofoid and MacLennan, 1932). 



