NOTES ET REVUE xlvii 



host and becomes a inultinucleate schizont. Tliis gives rise to a 

 small iiumber of nierozoites which are set free inlo the giit and 

 become trophozoites of tlie second génération. Thèse tropliozoites 

 or gametoc\ tes associate in pairs and encystment follows, and the 

 resuit of conjugation is the production of sporocysts and then 

 sporozoites, which serve for the infection of a new host. 



The organism herein described does not belong to anyhitherto 

 described genus of the Schizogregarines. 



Its body form séparâtes it from Ophryocystls, described first by 

 ScuNEiDER (7), and recently the subject of a monograpli by Léger 5) 

 and also from Schizocyslis (4), for it possesses no pseud-amoeboid 

 processes as do thèse gênera, while its schizogony also is intra- 

 epithelial. Unlike the Selenidiidae described by Brasil (1 , and by 

 Brasil and Fantuam (2), the myonemes of Merogregarina are 

 restricted to the anterior région of the organism, while its spores 

 are octozoic and not tetrazoic. There is no close similarity between 

 it and Aggregata {Eucoccidium), recently reconsidered and referred 

 to the Schizogregarines by Léger and Dlboscq (6), Aggregata being 

 further differentiated from the rest of the group by the sporogony 

 occurring in cephalopod Molluscs and the schizogonic cycle in Crabs. 



On the whole, 1 consider Merogregarina is nearestin its afhnities to 

 the^'eZe>n'rf»'c?ae,with which itagreesinpossessingdetînitemyonemes 

 and intra-epithelial schizogony. I consider it a new genus of the Schi- 

 zogregarines, adjacent to the Selenidiidae in systematic position. 



The characteristics of the new genus wouldbe as follows: — The 

 trophozoite is non-septate, ovoid, possessing a small, defînite 

 epimerite which is shaped like the head of a lance. Myonemes are 

 présent, but are restricted to the ectoplasm of the anterior région 

 of the body, their position being delimited by the nuclear mem- 

 brane. Schizogony isintra-epithelial, the schizonts being numerous 

 but the number of merozoites produced by each being relatively 

 small. Sporogony occurs in the lumen of the gut, the spores being 

 octozoic. At présent one species only is known, Merogregarina 

 amarot/cz/, from the composite Âscidian, Amarourium.'ï\\\ii species 

 has the characters of the genus. 



I find from Labbé's monographon the Sporozoa in " DasTierreich "" 

 that Giard in 1873 described a Gregarine, Lankesteria amaroecii, 

 from the gut of Aiaaroeciina punctum, occurring at RoscofT. On 

 Consulting Giard's original memoir, I find that the shape of the 



