SPIROTRICHA, OLIGOTRICHA 



661 



near anterior end; posterior zone only half-spiral; in the caecum and 

 colon of horse. One species. 



S. eqid F. (Fig. 311, e). 77-180m by 30-74//; widely distributed. 



Genus Triadinium Fiorentini. More or less helmet-shaped; com- 

 pressed; adoral zone at anterior end; 2 posterior (ventral and dorsal) 



Fig. 311. a, Ophisthotrichutn janus, X370 (Dogiel); b, Cunhaia curvata 

 X670 (Hasselmann); c, Cycloposthiwm hipalmatum, X300 (Bundle) 

 d, C. dentiferum, X270 (Hsiung); e, Spirodinium equi, X270 (Hsiung) 

 f, Triadinium caudatxmi, X300 (Hsiung) ;g, T. minimum, X440 (Hsiung) 

 h, Tetratoxum unijasciculatum, X280 (Hsiung). 



zones; with or without a caudal projection; in the caecum and colon 

 of horse. 



T. caudatum F. (Fig. 31 IJ). 59-86/x by 5(>-68m. 

 • 7". ^aZea Gassovsky. 59-78^ by 50-60m. 



T. minimum G. (Fig. 311, gr). 35-58m by 30-40^. 



