LANKESTERIA. 77 



Genus LANKESTERIA Mingazzini, 1891. 



Lankesteria, Mingazzini, 1891, p. 407, ; 1893, pp. 50, 63 ; Labbe, 

 1899, p. 46; Minchin, 1912, pp. 327, 329; Wenyon, 1926, 

 pp. 1121-4, fig. 465; Reichenow, 1929, pp. 889-90; Bhatia, 

 1930, p. 161 ; Ray, 1933, pp. 392-6 ; Calkins, 1933, p. 559. 



Trophozoites more or less spatulate or leaf-shaped, of small 

 size. Epimerite small, described as an anterior pseudopodium- 

 like process. Gametocysts spherical, produced by association 

 of two individuals after contraction. Sporocysts oval, octozoic. 

 Intestinal parasites of Tunicates, Insects, etc. 



Key to Indian Species . 



1 (4). Trophozoite elongate 2. 



2 (3). Trophozoites 50-200 fi. Epimerite 



simple or umbrella-shaped. Nucleus 

 spherical, with a single karyosome. 

 Gametocysts spherical. Sporocysts 

 spindle-shaped L. culicis (Ross), p. 77. 



3 (2). Trophozoite with strongly thickened, 



often spherical anterior end. Nucleus 



large, with one, two, or many karyo- [p. 81. 



somes L.tripteroidesifS^.nov., 



4(1). Adult trophozoite egg-shaped or pear- 

 shaped, 101-4 /i by 78 jU. Nucleus 

 large, spherical, with a single karyo- 

 some. Gametocysts spherical or broad- [Swaminath), p. 79. 

 ly oval. Sporocysts spindle-shaped . . L. mackiei (Short & 



20. Lankesteria culicis (Ross). (Fig. 22.). 



^Gregarina culicis, Ross, 1895, p. 346 ; 1898, p. 147 ; 1906, pp. 102, 

 103. 

 Gregarine sp., Marchoux, Salimbeni, and Simond, 1903, p. 713. 

 Lankesteria culicis, Wenyon, 1911 a, p. 273 ; 1926, pp. 1121-4, 

 fig. 465 ; Knowles, 1928, pp. 495-9 ; Reichenow, 1929, p. 890; 

 Lan-Chou, 1930, pp. 361-2, pi. xii, figs. 1-20. 

 ■ -f Lankesteria culicis, Ray, 1933, pp. 392-6, pi. xxiii. 



Young trophozoites intracellular in the epithelial cells of the 

 stomach of the host-larva, developing a simple pseudopodium- 

 like epimerite, by which the full-grown trophozoite remains 

 attached to the epithelial cell while hanging into the lumen 

 of the stomach. Eventually trophozoites become free and 

 move about amongst the intestinal contents. The free-living 

 forms have a granular cytoplasm, and at the anterior end the 

 remains of the organ of fixation, or epimerite, can be detected. 

 There is a large central spherical nucleus, with usually a single 

 large karyosome. 



When the larva becomes a pupa, the trophozoites leave the 

 gut and enter the Malpighian tubes, within which they associate 

 in pairs and form large spherical gametocysts. The gametes 

 produced by the two Gregarines are of the same size, but 

 differ as regards their nuclei ; those produced by one have 



