TELOSPORIDIA 89 



swallowed by new members of the host species, in whose intestine the 

 spore cases are digested and the process repeated. 



Ophryocystis (Fig. 77). Parasitic in the Malpighian tubules of beetles. 

 The cushion-shaped trophozoites are attached to the host's cells by- 

 branched processes. After sevetal generations of schizogony, they 

 become free gamonts, enter into syzygies, encyst, and within the 



Fig. 76. A diagram of the life cycle of Schizocystis. 1-4, Schizogony. 5, 

 Gamonts. 6, Syzygy. 7-9, Gamogony in a cyst (gamocyst). 10, 11, Syn- 

 gamy. 12, Freed spore case containing sporozoites resulting from sporogony. 



gamocyst undergo two divisions, whereby each forms one definitive 

 gamete and a binucleate enveloping cell which perhaps represents 

 abortive gametes. Syngamy then takes place, and the zygote divides 

 to form within the enveloping cells a parcel of eight sporozoites in a 

 case. Thus each syzygy produces only one pair of gametes and results 

 in only a single spore. 



