80 ILLINOIS BIOLOGICAL MONOGRAPHS [318 



are formed very rapidly and vary in length. After reaching a considerable 

 length the pseudopodia usually travel posteriorly along sides of body 

 and then disappear. Endoplasm very transparent, often vacuolated, 

 containing numerous small fat globules. Size of full-grown trophozoite: 

 25 fx by 10 to \2yL in average. Disporous. 



Spore: Crescent-shaped. Valves cylindrical, not compressed, ends 

 rounded, one valve being somewhat longer and more conical than the other. 

 Polar capsules convergent. Coiled polar filaments distinct. Sporoplasm 

 granular, asymmetrically situated, sometimes being almost confined to 

 more conical valve. Dimensions: breadth 22 to 2An, sutural diameter 6m, 

 diameter of polar capsules 3jw. 



CERATOMYXA NAVICULARIA Davis 



[Figs. 72 and 73] 

 1917 Ceratomyxa navicularia Davis 1917 : 230 



Habitat: Urinary bladder of Paralichthys dentatus, P. albiguttus, 

 Sphaer aides maculatus; Beaufort (June to August). 



Vegetative form: Rounded or slightly irregular in shape, never pyri- 

 form. Body colorless. Very slow ameboid. No distinct ectoplasm. 

 Entire trophozoite finely granular, containing a few small fat globules. 

 Nearly entire body is used up in the formation of spores. Diameter about 

 17jLi. Disporous. 



Spore: Variable in shape and size. Symmetrical or asymmetrical, 

 often boat-shaped, slightly compressed dorso-ventrally, with rounded 

 ends. Polar capsules convergent, shows polar filament indistinctly. 

 Sporoplasm finely granular, extending into both valves, but usually 

 somewhat farther into one than the other. Dimensions: breadth 14 to 22/i 

 (average 16)u), sutural diameter 5 to 7.5)u (average 6yu), diameter of polar 

 capsules 2/x. 



CERATOMYXA SPINOSA Davis 

 [Fig. 74] 



1917 Ceralomyxa spinosa Davis 1917 : 230 



Habitat: Urinary bladder of Paralichthys albiguttus; Beaufort. 



Vegetative form: Rounded or slightly irregular in shape, with short, 

 lobose pseudopodia; slowly ameboid. Body colorless and transparent. 

 Distinct differentiation of protoplasm along the entire surface, ectoplasm 

 forming outer layer. Endoplasm faintly granular, with numerous small 

 fat globules. Monosporous and disporous. 



Spore: Central portion greatly enlarged; ovoid, with very long tapering 

 process extending out from each end. Sutural line perpendicular to the 

 longest diameter. Polar capsules large and spherical. Sporoplasm finely 



