CNIDOSPORIDIA, MYXOSPORIDIA 



525 



S. polymorpha Davis (Figs. 249, c; 250, a-e). In the urinary blad- 

 der of toadfish, Opsanus tau and 0. beta. Trophozoites amoeboid 

 with conical pseudopodia; up to 100m long, the majority being 20-50/x 

 long; plasmotomy; disporoblastic; disporous or polysporous. Spores 

 spheroidal; shell-valves finely striated; polar capsules divergent; 

 fresh spores measure 7. 5-9. 5m by 7-8m. The trophozoites suffer fre- 

 quently infection by Nosema notahilis (p. 538). 



*S. tincae Plehn (Fig. 249, d-i). In the kidney and other viscera 

 of Tinea tinea in France and Germany; cause of epidemic disease 



Fig. 250. a-e, Sphaerospora polymorpha (Kudo), a, a trophozoite in life, 

 X1840; b, a stage in a simple plasmotomy, X850; c, front view and d, an- 

 terior end view of fresh spores, X1700; e, a spore with the extruded polar 

 filaments (one is shown only in part), X1700. f-h, Myxidium serotimim. 

 f, a stained young trophozoite, X1840 (Kudo); g, h, two views of fresh 

 spores showing the ridges on shell-valves, XllOO (Kudo and Sprague). 



among young tench; disease is manifest by great distension of anter- 

 ior portion of abdomen and up-turned mouth : infection fatal through 

 rupture of abdominal wall; spores 7-8. 75m in diameter. 



Genus Sinuolinea Davis. Spherical or subspherical spores; su- 

 tural line sinuous; with or without lateral processes; 2 spherical 

 polar capsules; in urinary bladder of marine fish. 



S. dimorpha D. (Fig. 249, j, k). In Cynoscion regalis; spores 15m in 

 diameter. 



