200 SPOBOZOA. 



Reichenow (1929) amended the family and included in it 

 a number of other genera, such as Pseudoklossia Leger & 

 Duboscq, Merocystis Dakin, Myriospora Lermantoflf, Caryo- 

 tropha Siedlecki, and Angeiocystis Brasil, all parasites of marine 

 worms, molluscs and crustaceans, in which the oocyst develops 

 many sporocysts (except in Angeiocystis Brasil, in which only 

 four are developed) containing two or more (up to thirty) 

 sporozoites. In some of these genera schizogony is not known, 

 and therefore is presumed to take place in some other host. 

 Hoare (1933), in accordance with his scheme of classification, 

 has transferred Angeiocystis to the subfamily Eimeriinse, 

 and has retained the others in his subfamily Aggregatinse. 

 Mackinnon and Ray (1937) have shown that the sporozoan 

 parasite hitherto known as Monocystis ihalassemse Lankester 

 is a coccidian, and have placed it in a new genus, Ovivora, 

 belonging to this subfamily. 



Genus AGGREGATA Frenzel, 1885. 



" Sac a Psorospermies," Van Beneden, 1854, p. 9. 



Monocystis sp., Lieberkiihn, 1855, p. 9, pi. viii, figs. 9, 12. 



Benedinia, Aime Schneider, 1875 a, pp. xl-xlv. 



Klossia, Aime Schneider, 1883, pp. 78-104, pis. viii, ix. 



Aggregata, Frenzel, 1885, p. 560. 



Gregarina, Frenzel, 1885, pp. 572, 576, 578. 



Benedinia, Labbe, 1895, p. 381 ; 1899, pp. 54-5. 



Klossia, Labbe, 1896, p. 535, pi. xii, fig. 20 ; pis. xv, xvi, xviii, 

 figs. 1-12; 1899, p. 54. 



Aggregata, Labbe, 1899, p. 6. 



Leger ia, Blanchard, 1900, p. 159. 



Eucoccidium, Luhe, 1902, pp. 771-3. 



Legerina, Jacquemet, 1903, pp. 193-4. 



Aggregata, Leger & Duboscq, 1906, pp. 1001-3 ; 1908, pp. 44-108 ; 

 Moroff, 1906 a, pp. 652-4 ; 1908, pp. 1-224 ; Pixell-Goodrich, 

 1914, pp. 159-74; Dobell, 1914, pp. 1-7; 1925, pp. 1-136; 

 Wenyon, 1926, pp. 870-5, figs. 376-8; Knowles, 1928, pp. 366-8; 

 Reichenow, 1929, pp. 928-31, figs. 894-7 ; Kudo, 1931, p. 270, 

 fig. Ill ; Calkins, 1933, p. 566; Reichenow, 1935, p. 373. 



Oocyst contains many sporocysts, each developing three 

 sporozoites. Schizogony takes place in a crab, and sporogony 

 in a cephalopod host. 



Remarks. — The life-cycle of ^. eberthi Labbe has been studied 

 by a number of workers. The nucleus of the zygote divides 

 repeatedly, and numerous sporoblasts, and finally sporocysts, 

 are developed in the oocyst in the body of a cuttlefish. Each 

 sporocyst contains three sporozoites and a residual mass. 

 A crab is infected by eating the infected material passed in 

 the dejecta of a cuttlefish. The sporozoites are liberated 

 in the intestine of the crab and, passing through the lining 

 cells, grow into schizonts, which form cysts that bulge into 

 the body-cavity, and by schizogony produce innumerable 



