532 



PROTOZOOLOGY 



M . rostrata Mulsow (Figs. 92, 228). Elongate oval; average dimen- 

 sions 450/z by 220/x; anterior end often drawn out into a process; 

 pellicle thick, longitudinally striated; cysts about 750 /x in diameter; 

 spores 23/x by 9ju," in the seminal vesicles of Lumbricus terrestris. 

 Mulsow (1911) found vegetative stages in autumn and winter and 

 sporogony in spring. Meiosis in the last pre-gametic division (p. 207). 



Fig. 227. a-c, Monocyslis ventrosa (a, X260; b, X150; c, X830) 

 (Berlin); d, e, M. lumbrici, X280 (Berlin); f. Apolocystis gigantea, 

 X90 (Troisi); g, A. minuta, with attached phagocytes, X770 (Troisi); 

 h, Nematocystis vermicularis, X80 (Hesse); i, j, Rhabdocystis claviformis 

 (i, X220; j, X270) (Boldt); k, 1, Enterocystis ensis (k, X140) (Zwetkow). 



Genus Apolocystis Martiis. Trophozoites spherical; without 

 principal axis marked by presence of any special peripheral organ; 

 solitary; spore biconical; in seminal vesicles or coelom of various 

 oligochaetes. Many species. 



A. gigantea Troisi (Fig. 227, /). In seminal vesicles of Helodrilus 

 foetidus and Lumbricus rubellus; late October to March only; fully 



