80 JLUNOIS 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: 

 25/1 by 10 to 12/i 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 i 



granular, asymmetrically situated, sometimes being almost confined to 

 more conical valve. Dimensions: breadth 22 to 24m, sutural diameter 6/i, 

 diameter of polar capsules 3/x. 



CERATOMYXA NAVICULARIA Davis 



[Figs. 72 and 73] 

 1917 Ceratomyxa navicularia Davis 1917 : 230 



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

 Sphaeroides 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 

 17/1. 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/x 

 (average 16/Lt), sutural diameter 5 to 7.5m (average 6m), diameter of polar 

 capsules 2m. 



CERATOMYXA SPINOSA Davis 



[Fig. 74] 



1917 Ceratomyxa 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 



