194 



THE SPO-ROZOA 



maldaneorum, R. and L. (Fig. 37), from the coelom of Liocephalus liopygus and 

 Glymene lumbricalis. Genus 7. Cystobia, Mingazzini, 1891. Trophozoites 

 large, oval or irregular in form, with two nuclei, resulting probably from 

 early fusion of associated individuals (Fig. 23). 

 Spores with dissimilar poles, the epispore form- 

 ing a funnel-like projection at one pole, some- 

 times also a tail-like expansion at the other 

 (Fig. 38). Parasites of Holothurians occurring 

 in the blood-vessels, whence the cysts dehisce 

 into the coelom. Type G. holothuriae (Ant. 

 Schn.) from Holothuria tubulosa. Genus 8. 

 Lithocystis, Giard, 1876. Trophozoites large, 

 ovoid or vermiform, with the endoplasm filled 

 with crystals of calcium oxalate. Spores with 

 long tubular processes of the epispore at one 

 spores of ^Cy'stoUa irregu- P ole ' Unique species L. schwideri, Giard (Fig. 

 laris (Minchin), (par. Holothuria 39), from the coelom of various Echinids. 

 Sffli^^iSKS,^ Genus 9. Ceratospora, Leger, 1892. Tropho- 

 losa). (After Minchin.) zoites of elongated conical form, associating by 



their truncated extremity, and giving rise to 



spores without encystment and without change of external form. Spores 

 oval, with a collar-like expansion at one extremity, and two long rigid 

 filaments at the other (Fig. 34, &). Unique species G. mirabilis, Le"g., from 

 the body-cavity of Glycera sp. Genus 10. Urospora, A. Schneider, 1875. 

 Trophozoites large, spores oval, with a caudal filament at one pole (Fig. 

 34, j). U. saenuridis (Koll.), from the vesiculae seminales and coelom of 

 Tubifex rivulorum. Other species from Nemertines, Sipunculus, Synapta, 

 etc. Genus 11. Gonospora, A. Schneider, 1875. Trophozoites ovoid, 

 piriforrn, or vermiform (Fig. 20). Spores with dissimilar poles, rounded 

 at one extremity, bearing one or more tooth-like processes at the other 

 (Fig. 34, K). Four species, all from the coelomic cavities of Polychaeta. 

 Type G. terebellae (Koll.), from Terebella, etc. Genus 12. Syncystis, A. 

 Schneider, 1886. Trophozoites ovoid or piriform. Spores navicular with 

 four divergent bristles at each extremity. Unique species S. mirabilis, A. 

 Schn., from the body-cavity and fat-body of Nepa cinerea. Genus 13. 

 Diplocystis, Kiinstler, 1887. Trophozoites of "coelomic" habitat, associat- 

 ing precociously to form spherical masses. Spores spherical or oblong. 

 D. schneideri, Kunst., from the body-cavity of Periplaneta americana. D. 

 major, Cu6n., and D. minor, Cuen. (Fig. 22), from the common cricket. 

 Genus 14. Lankesteria, Mingazzini, 1891. Trophozoites more or less 

 spatulate (Fig. 13). Spores oval (compare Fig. 29, f). Type L. ascidiae 

 (Lank.), from the gut of Ciona intestinalis. The sporozoan parasite described 

 by Pollard, 1 from the intestinal epithelium of Amphioxus, is identified by 

 Labb4 as the intracellular stage of a Gregarine belonging to this genus. 

 Genus 15. Callyntrochlamys, Frenzel, 1885. Trophozoites with the body 

 constricted into two regions not separated by any septum, and with 

 a fur-like covering of rods, resembling cilia, clothing the surface of the 



1 Quart. Journ. Micr. &ci., N.S. xxxiv. p. 311. 



