204 The Philippine Journal of Science isi? 



Subphylum SPOKOZOA — Continued. 



Class Telosporidia (Schaudinn) — Continued. 

 Order Gregarinida^ — Continued. 



Suborder Schizogregarinse — Continued. 



budding. Typical genera: Schizocystis Leger, 1900; Microte- 

 niella Calkins, 1915. 

 Suborder Eugregarinss (Leger). — Spore formation apparently is the 

 sole method of reproduction. If division takes place at all, it 

 occurs in the host cell during the "young" stages. 

 Tribe 1. Acephalinae (KoUiker). — No epimerite is formed. There 

 is no division into chambers. Typical genus, Monocystis Stein, 

 1848. 

 Tribe 2. Cephalinse (Delage). — An epimerite is present at some 

 stage in the life cycle. There is division of the body by a 

 septum into protomerite and deutomerite. The trophozoites 

 frequently associate in couples arranged tandem-fashion. 

 These individuals are styled the primite and satellite, re- 

 spectively. Members of this tribe are found parasitic in the 

 digestive tracts of Arthropoda. 

 Legion A. Gymnosporea. — No sporocysts or specially protected 

 sporoblasts are formed, the sporozoites arising directly 

 from the sporoblast mother cells. 

 Family Aggregatidae (Labbe). — There are a nimaber of residual 

 masses about which the sporozoites are irregularly grouped. 

 Typical genus, Aggregata Frenzel, 1885. 

 Family Porosporidae (Labbe). — There are no protective sporo- 

 cysts. Special centers (sporoblast centers) of sporozoite 

 formation are present. Typical genus, Porospora A. Schnei- 

 der, 1875. 

 Legion B. Angiosporea (Leger). — Characterized by well-developed 

 sporocysts. These have an inner and an outer coat, the 

 endospore and epispore, respectively. 

 Family Gregarinidae (Labbe). — The sporocysts may or may not 

 have sporoducts. The spores are barrel-shaped or oval 

 and in cases where sporoducts are present are united in 

 strings. The trophozoites have a simple epimerite. Typ- 

 ical genus, Gregarina Dufour, 1828. 

 Family Didyraophyidse (Leger). — This family is characterized 

 by the association of the sporonts in pairs. This epimerite 

 of the satellite disappears, which gives the appearance 

 of an organism having three chambers and two nuclei. 

 Typical genus, Didymophyes Stein, 1848. 

 Family Dactylophoridae (Leger). — The sporocyst opens by sim- 

 ple rupture or by the swelling of the "pseudocyst" or 

 residual mass of plasm. The epimerite is irregular and 

 asymmetrical and is fitted with digitiform processes. 

 Typical genus, Pterocephalus A. Schneider, 1887. 

 Family Actinocephalidae (Leger). — Sporonts have simple, sym- 

 metrical, or irregular appendages and are always solitary. 

 The spores are biconical, cylindrical, or navicular. The 

 cysts open by simple rupture. Found parasitic in the 

 digestive tracts of carnivorous Arthropoda. 

 Group A. Sciadiophorinae (Labbe). — The protomerite is um- 



