1 96 THE SPOROZOA 



Ophioidina, Mingazzini, 1891. Trophozoites elongated, vermiform, the 

 body cylindrical, blunt at one end, pointed at the other. 0. bonelliae, 

 Frenz., from the gut of Bonellia viridis. Two other species are also 

 referred to this genus. Genus 19. Kollikerella, Labbe, 1899 (nom. nov. 

 for Kollikeria, Ming., 1893, preoccupied). Trophozoites of rhomboidal 

 form, the anterior extremity rounded and forming a sort of head, 

 separated by a constriction from the rest of the body. Unique species 

 K. staurocephali (Ming.), from Staurocephalus rudolphii. Genus 20. Lobian- 

 chella, Mingazzini, 1891. Trophozoites of elongated form with the 

 anterior end rounded. Unique species L. beloneides, Ming., from the 

 coelom of Aldope sp. 



TRIBE 2. CEPHALINA, Delage ( = Potycystidea auct + Doliocystidae). 

 Eugregarinae which always possess an epimerite, which may be present 

 only in the young stages or may be a permanent organ. The body is 

 divided, typically, by a septum into protomerite and deutomerite, but may 

 be simple, non-septate. Parasites chiefly of Arthropods, usually occurring 

 in the gut. 



(a) SUB-TRIBE GYMNOSPOREA, Ldger. The cyst contains naked 

 gymnospores (sporozoites) not enveloped in sporocysts to form spores. 



FAMILY 1. AGGREGATIDAE, Labbe. Sporonts septate, forming associa- 

 tions of two or more individuals. Sporozoites grouped irregularly round 

 a number of residual masses (Fig. 32). 



Genus 21. Aggregate/,, Frenzel, 1885. Trophozoites elongated, 

 cylindrical. A. portunidarum, Frenz., from the intestine of Carcinus 

 maenas and Portunus arcuatus, and several other species from other 

 Crustacean hosts. 



FAMILY 2. POROSPORIDAE, Labbe. Each sporoblast gives rise to 

 numerous sporozoites grouped round a residual mass, but the " spores " so 

 formed are not enveloped in sporocysts (Fig. 41). 



Genus 22. Porospora, A. Schneider, 1875. Epimerite minute, 

 button-like. Trophozoites large, septate, usually solitary (Fig. 1), some- 

 times associated (Fig. 40). Unique species P. gigantea (E. v. Ben.), from 

 the gut of the lobster. 



(6) SUB-TRIBE ANGIOSPOREA, Leger. Spores well developed, with 

 double sporocysts composed of epispore and endospore. 



FAMILY 3. GREGARINIDAE, Labbd (Clepsydrinidae, Le"ger). Tropho- 

 zoites with simple epimerites (Fig. 17, a). Cysts with or without sporo- 

 ducts. Spores oval, in forms without sporoducts (Fig. 34, a), but in forms 

 with sporoducts they are barrel-shaped (Fig. 34, c) and united in strings 

 by their flattened ends. 



Genus 23. Gregarina, Dufour, 1828 (Clepsydrina, Hammer- 

 schmidt, 1838). Epimerite conical or knobbed, rarely large. Cysts 

 spherical or oval with sporoducts (Figg. 28 and 42). Spores barrel-shaped 

 (Fig. 34, c). G. blattarum, Sieb. (Fig. 42), from the common cockroach 

 Periplaneta orientalis ; G. ovata, Duf., from the earwig Forficula auri- 

 cularia ; G. polymorpha (Hamm.), from the meal-worm ; and numerous 

 other species, parasitic in the intestinal tracts of insects. Genus 24. 

 Gamocystis, A. Schneider, 1875. Trophozoite with transitory protom., 

 resembling a monocystid. Cyst with sporoducts. Spores elongated, 



