THE MICROSCOPE IN ETIOLOGY. 331 



found in the liver and intestines of rabbits and of man, 

 and are regarded as the resting stage of gregarince. 



INFUSORIA. Family, Heterotricha. Body covered with 

 cilia, often in longitudinal rows. Stronger cilia about 

 the mouth. 



Balantidium Boli. A common parasite in the rectum 

 of hogs. Found sometimes in human intestine. 



FLAGELLATE. Infusorial organisms with lashlike cilia. 

 Family, Monadina. Round or oval. Transparent. A 

 single or few whiplike hairs on anterior extremity. 



Cercomonas. With caudal filament and generally a 

 single thin and long lash. 



C. Intestinal is. Found in the stools of cholera and 

 typhoid fever, and on catarrhal mucous membrane of 

 children. 



C. Urinarius. Urine of cholera and in alkaline albu- 

 minous urine. 



C. Saltans. On the dirty surface of ulcers. 



Trichomonas. With two or three short cilia near the 

 anterior lash. 



T. Vaginalis. In the yellow acrid mucus of vaginal 

 blennorrhoaa. 



II. YERMES (Worms). 



1st Class. Platodes Platyelmia. Flat worms. Bodies 

 flat, appendages, when present, of suckers and hooks. 

 Generally hermaphrodite. Many without mouth or in- 

 testine, nourished by absorption. 



1st Order. Cestodes. Tapeworms. Long, articulated, 

 flat, without mouth or alimentary canal. Prehensile or- 

 gans anterior. The anterior part or head is small and 

 somewhat globular. The neck is thinner. The joints 

 lengthen and broaden in continuous succession until they 

 reach their greatest circumference at the posterior ex- 

 tremity, where they may separate and live independently 



