116 SPOROZOA. 



contains a variable number of flattened sporocysts, each with 

 two sporozoites. Other characters as in the suborder and the 

 family. 



43. Adelea pachelabrse de Mello. 



■fAdelea pachelabrse, de Mello, 1921, p. 242. 

 Adelea pachylabree, Wenyon, 1926, p. 1069. 

 Adelea pachelabrsR, Reichenow, 1929, p. 912. 



Schizonts show a sexual dimorphism. Macroschizonts 

 rounded or oval, with the cytoplasm markedly alveolar, 

 containing granules of reserve material, and the nucleus 

 surrounded by a distinct membrane. Binary fission equal or 

 unequal, leading to formation of up to sixteen nuclei. Micro- 

 schizont has a feebly alveolar, non-granular cytoplasm, 

 and the nucleus is compact and stains deeply. Macro- 

 merozoite is oval, with alveolar cytoplasm and spherical 

 nucleus. Micromerozoite is oval or fusiform, and its nucleus 

 contains a distinct karyosome. Fertihzation is preceded by 

 the association of gametes, one or several male gametes 

 (micromerozoites) being attached to a female gamete (macro- 

 merozoite). Female gamete is rounded oval, and possesses 

 a voluminous nucleus which does not show a karyosome. 

 Male gamete is generally smaller and attaches itself to one 

 of the poles of the female gamete. Zygote develops into an 

 oocyst with two binucleate sporoblasts, each nucleus repre- 

 senting a future sporozoite. Sporocysts dizoic. 



Remarks. — Wenyon (1926) considers it doubtful if this 

 parasite belongs to this genus. 



Habitat. — Intestine and digestive glands of a Mollusc, 

 Tachelahra mosstra Reeve : Porttjguesb India, Nova Goa. 



Genus ADELINA Hesse, 1911. 



Klossia (part), Aime Schneider, 1885, p. 7. 



Adelea (part), Labbe, 1896, p. 536 ; 1899, p. 56 ; Minchin, 1903, 



pp. 233, 235, 332. 

 Adelina, Hesse, 1911, pp. xv-xix ; Wenyon, 1926, pp. 1070-2; 



Reichenow, 1929, pp. 912-4 ; Kudo, 1931, p. 278 ; Calkins, 1933, 



p. 566 ; Reichenow, 1935, pp. 371-2. 



Oocyst thick-walled. Sporocysts spherical and compara- 

 tively few in number. 



44. Adelina schellacki Ray & Das-Gupta. 



Adelina schellacki, Ray & Das-Gupta, 1937, p. 291. 



Oocyst oval or egg-shaped, without residue ; eight spherical 

 sporoblasts, with two sporozoites, developed in each within 

 10 to 15 days if the unsegmented oocysts are kept in a moist 

 chamber. The oocystal membrane ruptures after being in 



