LANKESTBRELLA. 159 



Subfamily CRYPTOSPORIDIIN^ Poche, 

 emend. Hoare, 1933. 



Oocyst contains four, eight, or many sporozoites developed 

 without the formation of sporocysts. 



Genus LANKESTERELLA Labbe, 1899. 



Drepanidium, Lankester, 1882, pp. 53-65 ; Labbe, 1894, p. 76. 



Lankesterella, Labbe, 1899, pp. 73-5 ; Minchin, 1912, pp. 372, 378 ; 

 N6]ler,19136,p. 231; 1920 6, p. 176; Wenyon, 1926, pp. 878-80, 

 1105; Eoiowles, 1928, p.471; Reichenow, 1929, pp. 964-5; Kudo, 

 1931, p. 275 ; Calkins, 1933, p. 566 ; Hoare, 1933, pp. 383, 385. 



The whole of the development takes place in the endothelial 

 cells of the blood-vessels. The oocyst contains numerous 

 (32 or more) sporozoites developed without the formation 

 -of sporocysts. The sporozoites finally enter the blood- 

 corpuscles and are mechanically transferred to another host 

 by a blood-sucking animal. 



Remarks. — This genus includes certain types which were 

 originally considered as Haemogregarines of cold-blooded 

 animals. Noller (1913 a, 6 and 1920 h) showed that the forms 

 within the blood-corpuscles are sporozoites, and that the rest 

 of the cycle takes place in the endothehal cells of the blood- 

 vessels (instead of the intestine as in the typical coccidian) 

 and is of the Eimeria type. Reichenow (1919) described 

 another genus, Schellackia, from Hzards, in which the develop- 

 ment is on similar Hues, but takes place in the intestine. 

 He (1921 a) placed the two genera in a new family, Lankesterel- 

 lidse, and Wenyon (1926) followed this arrangement ; but 

 Reichenow (1929) has since placed both genera in the family 

 Eimeriidse, and Hoare (1933) has put them in a new subfamily, 

 -Cryptosporidiinse, of the same. 



Key to Indian Species. 



Sporozoite like a vermicule, with its anterior [p. 159. 



extremity tapering, 10-15 fi in length ... L. minima (Chaussat), 

 Sporozoite usually constricted into 3 segments, 



the middle containing the nucleus; [p. 162. 



15-16 /x in length L. monilis (Labbe), 



53. Lankesterella minima (Chaussat). (Fig. 72.) 



Anguillula minima, Chaussat, 1850. 



Drepanidium ranarum, Lankester, 1871, pp. 387-9, figs. 3, 4; 



1882, pp. 53-65; Labbe, 1891, p. 479; 1892, p. 617: 1893', 



p. 1207. 



