PARASITOLOGY. 211 
Animals Infested—The ox, sheep, pig and goat. 
Parts Infested—Most common in the oesophagus ; 
also found in the muscles of the trunk, head, and 
heart. 
Conditions Prodwced—They may cause an effusion 
into the tissues. If only a few are present no harm 
comes from the infestation; many may cause con- 
ditions similar to that produced by the Coccidia. 
Hemasporipia (Hemo—blood) 
(Sporidum—spore). 
The order Hemasporidia belongs to the class 
Sporozoa, and includes the genus Piroplasma. 
PrropLasmMa BiGEMINUM (Bis—twice) 
(Geminus—twin). 
Synonyms.—Pirosoma Bigeminum (soma—body), 
Piroplasma Bovis, Apisoma Bigeminum, Ambospor- 
idies, Portensis Virulentissimus, Babesia Bigeminum 
Bovis. 
Distribution—Found in the southern part of the 
United States; also in other warm countries. 
Description——They are pear-shaped protoplasmic 
bodies three to four microns long. 
Life Cycle—The adult protozoon inhabits the red 
blood cell. From this pear-shaped adult is formed 
corpuscles which are capable of invading other 
cells. The pear-shaped body becomes rounded, then 
divided into three to five corpuscles; these corpuscles 
have been noted to possess amoeboid movement, 
and are capable of invading new red blood cells. 
These divide into two parts, which develop to the 
full sized pear-shaped bodies; the pointed ends of 
these protozoa are usually close together, joined with 
a fine film. The tick, feasting upon an infested ox, 
