294 SPOKOZOA, 



have a more deeply staining cytoplasm, smaller nucleus, and 

 large black granules of pigment. 



Dimensions. — Schizonts l-5-4-5jU, by 1-2|U, ; gametocytes, 

 male 3-4-5|u. by 2-2-5 ^m, female 3-4/Lt by 2-2-5/x. 



Habitat. — Peripheral blood, as also smears from lungs 

 and hver of the ant-eater, Manes pentadactyla Linn, (popularly 

 known in Goa as the " Tyrio ") : Portuguese India, Nova 

 Goa. 



3. Family THEILERIID^ du Toit, 1918. 



Parasites of blood of Mammals, which do not form pigment 

 (hsemozoin). Schizogony takes place in the endothelial cells 

 of the capillaries of the internal organs, and the schizonts 

 (Koch's "blue bodies ") produce a number of merozoites. The 

 parasites finally invade the red corpuscles, within which they 

 occur as round, ovoid, rod-like or irregular forms. Show no 

 tendency towards a paired arrangement. The forms in the 

 red corpuscles do not reproduce, and are possibly gametocytes. 



The family includes the genus Theileria, the best-known 

 species of which, T. parva, causes the East Coast fever of cattle 

 in Africa and elsewhere. Species of Theileria have also been 

 recorded from sheep and goats in other countries. Du Toit 

 (1918) recognizes Eangelia Carini & Maciel (1914) as a distinct 

 genus, but Wenyon (1926) has advanced convincing reasons 

 for merging the two genera into one. 



Remarks. — There is no teneral agreement as regards the 

 position of this family and the following one in the system 

 of classification. Wenyon (1926) places the two families 

 Theileriidse and Babesiidse in a suborder Pieoplasmidea. The 

 suborder includes parasites which inhabit red blood-corpuscles 

 of Mammals, but do not form pigment (hsemozoin). In 

 films stained with Romanowsky's stain each parasite consists 

 of a blue-staining cytoplasm and a red-staining nucleus, 

 the latter generally consisting of a granule of chromatin 

 with a string of finer granules extending from it. If a vacuole 

 is present it becomes difficult to distinguish the form from 

 the young ring-form of a malarial parasite. The organisms 

 included in the suborder reproduce by division into two or 

 four individuals only. 



Reichenow (1929) places the family Theileriidse under 

 H^MOSPORiDiA and the family Babesiidse as an appendix 

 to the same. In his latest work (1935) he places both the 

 families in an appendix after the H^mosporidia, and remarks 

 that the life-cycle of the Theileriidse, so far as is known, 

 shows points of agreement with the typical H^mosporidia 

 but the plan of development of the Babesiidse is quite different 

 from the Telosporidia. In this work I have included the 



