ADBLEIDEA. 113 



14 (13). Gregariiie ovoid, with a process for 



attachment. Gametocyst contains 

 eight oocysts, each containing eight 

 sporozoites CauUeryellidse * Keilin. 



15 (8). Two types of schizogony, one intra- 



cellular and the other extracellular. 



Gametocyst contains a large number 



of oocysts, each containing eight [yavlensky. 



sporozoites Menzebieridse * Bogo- 



Up to the present time nobody has worked on the 

 Schizogregarines of India. 



II. Order COCCIDIA Leuckart, 1879. 



The CocciDiA have a wide distribution, occurring as para- 

 sites in the Vertebrates as well as the higher Invertebrates. 

 They are generally found as parasites of the epithelium of the 

 digestive tract and associated glands. Alternation of genera- 

 tions is invariably present : asexual reproduction is by 

 schizogony, and is followed by sexual reproduction by, in 

 most cases, anisogamy. During the whole of their growth 

 the male and the female gametocytes are apart and develop 

 independently of one another. The male gametocyte generally 

 produces a relatively large number (six or more) of male 

 gametes. Both kinds of reproduction take place in the body 

 of one and the same host (except in the Aggregatidse and 

 the Hsemogregarinidse). The Coccidia are divided into two 

 suborders, as follows : — 



1. Gametocytes dissimilar in size ; associated 



with each other during the later part of [p. 113. 



trophic life ; microgametes few Adeleidea Leger, 



2. Gametocytes similar in size ; independent, 



each microgametocyte developing into [p. 156. 



numerous microgametes Eimeridea Leger, 



I. Suborder ADELEIDEA Leger, 1911. 



The scbizonts develop into micro- and macrogametocytes 

 which become closely associated and develop in contact with 

 one another. The microgametocyte produces a few (two or 

 four) microgametes. The zygote divides into numerous 

 sporoblasts, each of which develops into a sporocyst with two 

 or four sporozoites. These sporozoites, which are small 

 gregarinulse, penetrate the epithehal cells of the host and 

 grow into large rounded or oval schizonts (agamonts). The 



SPOR. I 



