144 



General Biology 



talis) has been said to cause pyorrhea alveolaris (Fig. 55), but Rivas 

 holds that these Amoebae are the effect of infection and thus represent 

 a secondary infection which aggravates the primary infection. 



Class II. Sporozoa. 



Subclass 1. Telosporidia ( ). 



Order 3. Haemosporidia ( ). 



Plasmodium, which causes malaria. (See Fig. 50.) 



Subclass 2. Neosporidia ( ). 



Order 2. Sarcosporidia ( ). 



Sarcocystis miescheriana. (Fig. 56.) 



Medical men often call these organisms "Rainey's tubes." They 

 are found in the muscles of pigs. 



The tubes are ovoid bodies filled with small sickle-shaped 

 unicellular organisms — the Sarcocystis miescheri. It sometimes is found 

 in man, where it causes a serious disease called psorospermiasis, usually 

 fatal. 



Class III. Mastigophora. 

 Order 1. Flagellata. 

 Trypanosoma gambiense (Fig. 57) causes the disease known 



Fig. 56. 



Longitudinal section 



through muscle of a Pig, 

 c o n t a i ning Sarcocystis 

 Miescheriana (From 



Kiihn, after Braun). 



Trypanosoma gambiense, from 

 a case of sleeping sickness. 

 Different forms. (After Man- 

 son.) 



as trypanosomiasis, commonly called sleeping sickness. 



This parasite is found in many invertebrates and vertebrates. 



Its life history is divided into two stages. One a flagellate 

 monadine ( ) phase, in which the organisms live in the 



blood-stream of vertebrates, in some of which they cause serious disease ; 

 the other is a gregarine ( ) non-flagellate phase which 



may also be parasitic. This latter type is met with in forms of Kala 

 Azar. 



This organism causes sleeping sickness, which is common in 



