PROTOZOA. 175 



Measurements. Tsfoa" to T ^ (T jj" long: Tffj & ffff " to Tff ^ ffffff " wide. 



V. rugula. Found in dejections of cholera patients. V. bacillus and V. 

 lineola are found occasionally in mucus of mouth. V. cyanogenus and V. 



xantlwgenus at times found in milk. V. (?) has been found in the blood 



of patients affected with malignant pustule. (Wood.) 



Paramecium. Body covered with cilia; no eyespot; a papilliform tongue- 

 like process present ; aquatic ; stellate contractile vesicle (q. v., p. 55) well 

 seen. (Micrograph. Diet ) 



P. coli, Malmstein. A species found in the discharges of chronic dysen- 

 tery. Very rare. 



Cercomonas. Body rounded, or discoidal, tuberculated, with a variable 

 posterior prolongation in the form of a tail, which is longer or shorter, and 

 more or less filiform. (Micrograph. Diet.) 



C. davairtei, M. Tandon. Body pyriform ; integument soft ; posterior pro- 

 longation rigid, straight serves to fix the animal at times to surrounding 

 objects. They are true parasites, which live in the intestine of man when cer- 

 tain conditions are present that are requisite for their existence. (Davaine.) 



Measurement. 3'" long. 



Rarely found in cholera dejections. 



C. obliqua (1), Davaine. Resembles above, but smaller, more oval; cau- 

 dal filament arises somewhat from the sides. Rarely found in typhoid 

 fever dejections. 



Trichomonas, Duj. Body ovoid, or globular, becoming drawn out when 

 adherent to the slide, hence sometimes exhibiting a tail-like prolongation , 

 an anterior flagellitbrm filament present, with a group or row of vibratile 

 cilia. 



T. vaginalis. Body glutinous, nodular, unequal, frequently becoming ag- 

 glutinated to other objects ; movement vacillating. Found in morbid vaginal 

 mucus. (Mic. Diet.) 



Measurement. Length ?J S v". 



PSOROSPKRMI^B. Microscopic, oval, depressed, for the most part spindle- 

 shaped corpuscles, with or without a tail, exhibiting no movements, and con- 

 sisting of a tolerably firm outer coat covered with hair-like processes which 

 exhibit a very delicate and peculiar structure. Such bodies may aggregate 

 in cyst-like masses, the contents of which appear granular to low powers, 

 and exhibit a division into numerous segments, but it is found to consist en- 

 tirely of minute bodies resembling one another, possessing very definite char- 

 acters, being oval flattened, the body slightly curved laterally, with one 

 extremity blunt and the other almost pointed. Sometimes they are embed- 

 ded in a ramified sarcodic mass. (Micrograph. Diet.) 



Measurements. Corpuscles jo\f ff " long; 55^5" wide. Diameter of cyst 



