INTRODUCTION TO PROTOZOOLOGY 



(B) Neosporidia. 



The spore formation and trophic growth proceed simultaneously. 

 (4) Ciliata {Infusoria). 



These possess cilia throughout their whole existence or only during 

 the early stages of their life-cycle. The cilia are formed from the 

 ectosarc only. 



Reproduction is by transverse fission and budding. 



Protozoologists may decide upon a rearrangement of this classi- 

 fication later. 



Protozoa of pathogenic significance in man may be grouped as 

 follows : — 



(i) Sarcodina. 



Pathogenic amoeb^u are dealt with under Amoebic Dysentery. 



The Chlamvdophrys stercorea, a rhizopod, is believed to be an 

 ama:ba parasitic in man during one stage of its existence. It has been 

 found in cows, rabbits, mice and lizards, 



(2) Mastigophora. 



The Cercomonas hominis is a rounded or pear- 

 shaped single flagellated parasite found in normal 

 faeces, also in the excretions of diarrhoea and cholera 

 patients. 



The Cercomonas vaginalis is a similar parasite not 

 uncommonly found in the vagina of Cingalese native 

 women . 



The Tetramitus mesnili has a pear-shaped body 

 with three flagella and a large cytostome. It may 

 cause diarrhoea and dysentery. It has been seen in 

 people from the Crimea, Bahama, Hawaii and West 

 Africa. 



Trichomonas hominis may be found in some 

 diarrhoea patients. 



Trichomonas vaginalis has been found in Central 

 Africa, Ceylon and Kurope. Its name is descriptive. 

 Its presence does not necessarily give rise to symptoms. 



Lamblia intestinalis with its pear-shaped body 

 carries three flagella from its broad end and one from 

 the narrow end. 



It has been found in the rabbit, cat, dog, sheep 

 and large bowel of man. Its cysts can be found m 

 the faeces. Pathological changes are not severe. Treatment is difficult. 



The Peucocytozoidae.are not found in man. 



The Trypanosomidae are dealt with under special headings. 



The Herpetomonas (Leptomonas, Crithidia) are not found in man. 



Trichomonas iu' 

 testinalis from 

 man, showing an- 

 terior flagella, cyto- 

 stomic depression 

 anteriorly, undula- 

 ting membrane, 

 nuclei, and axo- 

 style. X 2,500. 

 Original. 



