PROTOZOA OB SIMPLEST ANIMALS. 
14c 
the intestine till they reach the sperm sacs ; each sporozoite attacks 
a sperm morula and grows into a trophozoite, thus completing the cycle. 
(2) Coccidia. The Coccidia most commonly attack epithelial 
cells, such as those lining the intestine or liver cells. 
The parasite Coccidium schubergi , which is found in the 
intestine of the centipede Lithobius forficatus , grows inside the 
Pig. 10c. 
Section of rabbit’s liver infected with 
Coccidium oviforme. After Balbiani. 
(From Minchin’s Sporozoa, Lan- 
kester’s Treatise on Zoology.) 
Fig. 10e.* 
Chloromyxum leydigi, x 525, 
parasitic on Dog-fish and Ray. 
Ect., ectoplasm; jos., pseudo- 
podia ; end., endoplasm ; y , 
yellow globules ; sp., spores 
with polar capsules. After 
Thelohan. (From Minchin’s 
Sporzoa, Lankester’s Treatise 
on Zoology.) 
infected cell, and at its expense, into an oval or spherical body. 
When full growth is reached, the parasite undergoes division 
into a number of small cells (merozoites), each of which becomes 
free and attacks another epithelial cell, attains maturity, and 
itself undergoes division, so that at last all the epithelium may 
be destroyed ; but a time comes when some of the merozoites 
become distinct male and female cells, the male breaking up into 
male “ gametes,” each with two flagella, the female remaining as a 
* For Fig. 10d see p. 14 d. 
B 3 
