GREGARINA. 95 
be no contractile vacuole and no nervous nor respiratory 
organs. 
The cuticular cap serves to fix the animal to the wall 
of the intestine in its young stages, but it is shed soon after 
the attachment is lost. Conjugation takes 
place but in a modified form. Two gregar- 
ines become closely opposed to each other but do not fuse. 
They together form a sphere which then becomes enveloped 
Reproductive. 
Fig. 31.—Lire-HisTory OF GREGARINA. 
I (After BuTScHLI.) 
Protomerite . 
Capsule 
Deutomerite 
Cyst. 
“Nucleus 
Cortex 
One 
Individual. 
Deutomerite. 
Protomerite. 
Other 
Individual. Epithelial Cell. 
x, The adult individual. 2, The cyst containing spores. 3, Asingle spore. 
4, Two conjugating individuals. 5, Five stages in the intracellular 
parasite, from left to right. 
ina cyst. Under cover of this cyst the reproductive pro- 
cess is effected, hence it is distinguished as a spovocyst from 
the simply protective cyst (or Aypuocyst) of Amada. The 
cyst is somewhat complex, for it has small tubular apertures 
for the subsequent escape of the spores. 
Inside the sporocyst the two gregarines break up by 
multiple fission into a great number of small fragments or 
spores, each of which secretes around itself a hard case. 
Sometimes the conjugates separate and a single Gregarina 
encysts and divides into spores. 
