HiEMOGREGAEINID^. 117 



the moist chamber for four or five days, and along with this 

 the unused microgametes are discarded. 



Habitat. — Intestine of the centipede, Cormocephalus dentipes 

 Poc. : Bengal, Calcutta. 



2. Family H^MOGREGARINID^E Leger, 1911. 



The researches of Reichenow and others have shown the 

 coccidial nature of the Hsemogregarines, long known to occur 

 in the red or white blood-corpuscles of all classes of Vertebrates. 

 They are in reahty Coccidia, which have certain stages adapted 

 to life within the circulating cells of the Vertebrate blood. 

 Schizogony may or may not take place in the blood- corpuscles, 

 but the gametocytes always enter the blood- corpuscles. The 

 fertilization process is of the Adelea-type. The formation of 

 oocyst and sporozoites takes place in the body of the blood- 

 sucking Invertebrate, which in turn transfers the sporozoites 

 to a second Vertebrate host. 



The group is also related to Lankesterelhdse, in which the 

 life-cycle is typical of that of Eimeridea and takes place either 

 in the intestine (the usual habitat of Coccidia) or in endothehal 

 cells of the blood-vessels. 



Wenyon (1926) raised the group to the rank of a suborder, 

 under the title Haemogregarinidea, and divided it into three 

 families, viz., Hsemogregarinidse Neveu-Lemaire, 1901 ; Hepa- 

 tozoidse Wenyon, 1926 ; and Karyohsidse, Wenyon, 1926. 

 Reichenow (1929) included the Hsemogregarines, as well as 

 Adelea and related genera, in a single family, Adeleidse Leger 

 emend. I have, however, followed Kudo (1931) m placing 

 the Hsemogregarines in a separate family from the Adeleidse. 



Key to Indian Genera. 



1 (3). Schizogony in the red. blood-corpiiscles 



of the internal organs of a Vertebrate . 2. 



2. Gametogony and fertihzation in the 

 body of blood-sucking Invertebrate 

 (leech). Oocyst small, directly pro- 

 ducing eight sporozoites, without form- [Danilewsky, p. 119> 

 ing sporocysts H^MOGBEGAnnsrA 



3 (1). Schizogony not in the red. blood-cor- 



puscles 4. 



4 (5). Schizogony in cells of the internal organs 



(liver, spleen, bone-narrow, etc.) or 

 leucocytes of Vertebrates. Gameto- 

 gony and fertilization in the body of 

 a blood-sucking Invertebrate (tick, 

 mite, etc.). Oocyst increases enor- 

 mously in size, producing sporoblasts, 



sporocysts, and sporozoites in the [p. 145. 



oocyst Hepatozoon Miller, 



