592 PROTOZOOLOGY 



Genus Eodinium Kofoid et MacLennan, Dorsal zone on the 

 same level as adoral zone; without skeleton; macronucleus a 

 straight, rod-like body beneath dorsal surface; 2 contractile 

 vacuoles; in cattle and sheep. Several species. 



E. lohaium K. et M. (Fig. 268, a). 44-60m by 29-37//; in Bos 

 indicus. 



Genus Diplodinium Schuberg. Adoral and dorsal zones on the 

 same level; without skeletal plates; macronucleus 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. 



D. dentatum (Stein) (Fig. 268, b). 65-82^ by 40-50^; in cattle 

 (including Bos indicus). 



Genus Eremoplastron Kofoid et MacLennan. Adoral and dor- 

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

 right surface; triangular or rod-like macronucleus, anterior end 

 of which often bent ventrally; 2 contractile vacuoles; in cattle, 

 antelope, sheep, reindeer. Numerous species. 



E. hovis (Dogiel) (Fig. 268, c). 52-100/x by 34-50^; in cattle 

 and sheep. 



Genus Eudiplodinium Dogiel. Adoral and dorsal zones at an- 

 terior end; a single, narrow, skeletal plate beneath right sur- 

 face; rod-like macronucleus with anterior end enlarged to form 

 a hook opening dorsally; pellicle and ectoplasm thick; 2 con- 

 tractile vacuoles with heavy membranes and prominent pores ; in 

 cattle. 



E. maggii (Fiorentini) (Fig. 268, d). 104-255/x by 63-170/1 ; in 

 cattle, sheep and reindeer. 



Genus Diploplastron Kofoid et MacLennan. Adoral and dorsal 

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

 macronucleus narrow, rod-like; 2 contractile vacuoles below dor- 

 sal surface, separated from macronucleus. One species. 



D. affine (Dogiel et Fedorowa) (Fig. 268, e). 88-1 20/i by 47- 

 65/i; in stomach of cattle, sheep, and goat. 



Genus Metadinium Awerinzew et 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; con- 

 spicuous oesophageal fibrils beneath dorsal and right sides; in 

 stomach of cattle, sheep, goat, and reindeer. 



