313] STUDIES ON MVXOSPORIDIA—KUDO 75 



diameter. Sporoplasm finely granular, filling the basal third of each valve, 

 sometimes extending farther into one valve than the other. Dimensions: 

 breadth 140 to 150/x, breadth of central portion 45/x, sutural diameter 6^, 

 diameter of the polar capsules 3fx. 



CERATOMYXA ATTENUATA Davis 



[Fig. 54] 



1917 Ceratomyxa attenuata Davis 1917 : 225 



Habitat: Gall-bladder of Scoliodon terrae-novae; Beaufort (July). 



Vegetative form: Elongate, pyriform, with long, tapering posterior 

 process; at anterior end numerous long filiform pseudopodia. Progressive 

 movements rapid. Ectoplasm distinct only at anterior end. Endoplasm 

 filled with small, refractive, yellowish or brownish granules, which are 

 uniformly distributed throughout the trophozoite. Between the brownish 

 granules, the endoplasm is clear and colorless, not granular, except at 

 extreme anterior end where it contains a clump of small fat globules. Size 

 of full-grown trophozoites 100 to 120 by 27 fx. Disporous. 



Spore: Valves greatly elongated; a symmetrical, one valve being about 

 15m shorter than the other and ending abruptly; the longer valve tapering 

 gradually to a point. About midway of each valve, is a thin septum; 

 external to the septum the valves are empty. Polar capsules are large, 

 opening on the anterior margin. Coiled polar filaments distinct. Sutural 

 plane oblique to longitudinal axis, usually forming a ridge. Sporoplasm 

 asymmetrically situated in central part of the spore. Dimensions: breadth 

 115ju, sutural diameter 9n, diameter of polar capsules 4.5/i, length of polar 

 filament 60//. 



CERATOMYXA RECURVATA Davis 



[Figs. 55 and 56] 



1917 Ceratomyxa recurvata Davis 1917 : 225-226 



Habitat: Gall-bladder of Cestracion zygaena\ Beaufort (July). 



Vegetative form: Pyriform with long, slender posterior process. 

 Body colorless. Actively motile, forming filiform pseudopodia of ectoplasm 

 at anterior end. Endoplasm colorless and granular, filled with large, 

 homogeneous spherules. Full-grown trophozoites 130 to 175^, length of 

 the main body about lOO/x. Spores are developed singly from distinct 

 sporoplasts and not necessarily in pairs. Disporous and polysporous (up 

 to 10 spores, 6 and 8 are common numbers). 



Spore: Valves greatly curved toward the posterior side, usually sym- 

 metrical, but occasionally one may be much more incurved than the other. 

 Valves circular in cross section at the base but toward the ends greatly 



