720 PROTOZOOLOGY 



Genus Prorodonopsis Gassovsky. Pyriform; ciliation uniform; 3 

 contractile vacuoles; macro nucleus sausage-shaped; in the colon of 

 horse. 



P. coli G. (Fig. 308, c). 55-67/* by 38-45/* (Hsiung, 1930a). 



Genus Paraisotrichopsis Gassovsky. Body uniformly ciliated; 

 spiral groove from anterior to posterior end; in the caecum of horse. 



P. composite G. (Fig. 308, d). 43-56/* by 31-40/* (Hsiung, 1930a). 



Genus Sulcoarcus Hsiung. Ovoid, compressed ; a short spiral groove 

 at anterior end; cytostome at ventral end of the groove; cytopyge 

 terminal; concretion vacuole mid- ventral, contractile vacuole pos- 

 terior to it; cilia on groove, posterior end and mid-ventral region 

 (Hsiung, 1935). 



S. pellucidulus H. (Fig. 308, e). 33-56/* by 30-40/*; in faeces of 

 mule. 



Genus Alloiozona Hsiung. Cilia in 3 (anterior, equatorial and pos- 

 terior) zones; in the caecum and colon of horse (Hsiung, 1930, 1930a). 



A. trizona H. (Fig. 308,/). 50-90/* by 30-60/*. 



Genus Ampullacula Hsiung. Flask-shaped; posterior half bearing 

 fine, short cilia; neck with longer cilia; in the caecum of horse. 



A. ampulla (Fiorentini). About 110/t by 40/* (Hsiung, 1930a). 



References 



Anigstein, L.: (1911) Ueber zwei neue marine Ciliaten. Arch. 

 Protist., 24:127. 



Bary, B. M. and Stuckey, R. G.: (1950) An occurrence in Welling- 

 ton Harbour of Cyclotrichium meuvieri Powers, a ciliate causing 

 red water, etc. Tr. Roy. Soc. New Zealand, 78:86. 



Beers, C. D.: (1927) Factors involved in encystment in the ciliate 

 Didinium nasutum. J. Morphol. Physiol., 43:499. 



— ■ (1930) On the possibility of indefinite reproduction in the 



ciliate Didinium, etc. Am. Nat., 63:125. 



(1933) Diet in relation to depression and recovery in the 



ciliate Didinium nasutum. Arch. Protist., 79:101. 



(1935) Structural changes during encystment and excyst- 



ment. etc. Ibid., 84:133. 



(1945) The encystment process in the ciliate Didinium 



nasutum. J. Elisha Mitchell Sc. Soc, 61:264. 



(1946) Excystment in Didinium nasutum, with special ref- 



erence to the role of bacteria. J. Exper. Zool., 103:201. 

 Butcher, A. D. : (1941) Outbreaks of white spot or ichthyophthiriasis 



(Ichthyophthirius multifiliis) at the hatcheries, etc. Proc. Roy. 



Soc. Victoria, 53:126. 

 (1943) Observations on some phases of the life cycle of 



Ichthyophthirius multifiliis, etc. Australian Zool., 10:125. 

 Calkins, G. N.: (1915) Didinium nasutum. I. J. Exper. Zool., 19: 



225. 



