SPECIAL MORPHOLOGY AND TAXONOMY OF SPOROZOA 429 



drawn out into chimney-like projections at one pole. One species, 

 C. holothurice, A. Sch., "from the blood vessels and body cavity of 

 holothurians. 



6. Genus Lithorystis, Giard (1876). The trophozoite is characterized by 



an endoplasm filled with crystals of calcium oxalate. The epispore 

 has long processes. A single species from the ccelomic ca\aties of 

 various echinids. 



7. Genus Ceratospora, Leger (1892). The trophozoites fuse by their 



truncated ends and give rise to spores without encj^sting. The spores 

 are characterized by long spinous processes. A single species, 

 C. mirabilis, Leger, from the body cavity of Glycera. 



8. Genus Urospora, A. Schn. (1875). The spores are characterized by 



the presence of a long caudal filament at one pole. Several species 

 from the bodj^ ca\'ities of oligochetes, nemertines, sipunculids, and 

 other marine invertebrates. 



9. Genus Gonospora, A. Sclin. (1875). The trophozoites are quite variable 



in form and give rise to heteropolar spores bearing from one to 

 several tooth-like processes at one pole, and rounded at the other. 

 Four species from the body cavities of polychaetous worms. 



10. Genus Syncystis, A. Schn. (1886). The spores are ovoid or boat- 



shaped, with spines or processes at each extremitj'. One species, 

 S. mirabilis, A. Sclin., from fat body and ccelom of species of Nepa. 



11. Genus Diplocystis, Kunstler (1887). The trophozoites fuse precociously 



to form spherical masses of gregarines in the body cavity of crickets 

 and cock-roaches. The spores are either spherical or oblong. 



12. Genus Lankesteria, Mingazzini (1891). The spores are more or less 



flattened or spatulate, oval in outline, and octozoic. Type species, 

 L. mcidicE, Lank, from the gut of Ciona i7itestinalis. 



13. Genus Colly ntrochlamys, Frenzel (1885). The trophozoites have a 



central constriction but no septum dividmg the lx)dy into protomer- 

 ite and deutomerite ; they are covered by a fur-like fringe of processes 

 resembling cilia. The spores are unknown. Type species, C. 

 phronimce, Frenz., from the gut of Phronima sedentaria. 



14. Genus Ancora, Labbe (1899). The trophozoite has a peculiar anchor- 



like form by reason of two lateral bulgings of the body. Spores 

 unknown. Species, S. sagittata, Leuck. from the gut of Capitella 

 capitata. 



Sub-order 2. Cephalina, Dp:lage (Polycystidea, Stein). 



Eugregarines possessing an epimerite at some stage of the life history 

 either in the adult phase or during the temporary young phases. The body 

 is usually divided by a septum into protomerite and deutomerite and the 

 gamonts are frequently associated in couples arranged tandem each couple 

 consisting of an anterior primite and a posterior satellite. Parasites 

 confined mainly to the digestive tracts of various arthropods. The 

 classification follows Watson (1916) with only minor changes. 



Family 1. Gregarinidse, Labbe (1899). Individual solitary or asso- 

 ciated (with satellites), in latter case with septum. Epimerites simple and 

 symmetrical. Cysts with or without sporoducts. 



1, Genus Gregarina, Dufour (1828). Biassociative. Epimerite small, 



cylindrical or globular; cysts open by sporoducts. 



2. Genus Hirmocystis, Labbe (1899). Individuals associated in groups of 



two to twelve. Epimerite a small papilla; cysts open by simple 

 rupture; sporoblasts ovoidal. 



