PARASITES OF PROTOZOA 



1081 



gregarine, after which they undergo reduction, producing gametes which 

 fuse; and finally the development of sporozoites from the zygote. Stubble- 

 field's observation that cysts rupture within the gregarine host is in 



Figure 224. Cysts of two species of Am p hi ac ant ha, metchnikovellids parasitic in the 

 gregarine Ophiodhia elongata from Lumhr'tco'tnereh. (After Stubblefield, MS.) 



agreement with the statement of Mackinnon and Ray (1931) that the 

 "spores" of Metchnikovella caulleryi have been seen escaping from the 

 cysts into the endoplasm of the gregarines. 



CauUery and Mesnil stated that Metchnikovellidae seem to have little 

 pathogenic action on the host, particularly in the vegetative stages. What 

 injury there is, is mechanical, when infection is heavy. Ganapati and Aiyar 

 (1937) noted that the entire cytoplasm may be packed with cysts, and 



