104 ILLINOIS BIOLOGICAL MONOGRAPHS [342 



the anterior end, one on each side of the sutural plane. Coiled polar 

 filament highly distinct (5 to 6 times) in vivo. Sporoplasm granular, shows 

 two nuclei when stained; no vacuole of any nature. Dimensions in vivo: 

 diameter 8 to 13^t, polar capsules 4 to 5^ by 2.5 to 3.5ju, length of polar 

 filament 35 to 40^ (KOH or pressure). 



Remarks: No species of the genus, has ever been found in the branchiae. 

 The characters of the spore, however, compel the writer to place the 

 form in the present genus. 



Genus SINUOLINEA Davis 

 1917 Sinuolinea Davis 1917 : 219 



The characters of the genus are described on page 57. 

 Type species: Sinuolinea dimorpha Davis. 



SINUOLINEA DIMORPHA Davis 

 [Figs. 205 to 213] 



1916 Sphaerospora dimorpha Davis 1916 : 333-377 



1917 Sinuolinea dimorpha Davis 1917 : 232-233 



Habitat: Urinary bladder and ureter of Cynoscion regalis; Beaufort. 



Vegetative form: Disporous and polysporous trophozoites differ 

 distinctly from each other. Disporous trophozoites irregular, colorless, 

 transparent and show slow movements. When attached to the epithelium, 

 rounded with one to several pseudopodia. Differentiation of protoplasm 

 distinct. Occasionally endoplasm contains one or more erythrocytes. 

 Average diameter of full-grown form 25 to'30)u. 



Polysporous form : when attached to the bladder epithelium, the free end 

 is drawn out into a long, cylindrical process, covered with numerous short, 

 hairlike ectoplasmic processes. While not movable, these processes are 

 readily absorbed and reformed. When the trophozoite is detached from 

 the epithelium, the larger end gives rise to numerous conical or arborescent 

 pseudopodia, by means of which the trophozoite moves slowly. Endoplasm 

 extends into the proximal portion of large pseudopodia. It is granular 

 and vacuolated, contains numerous fat globules, refractive granules, 

 yellowish crystals (hematoidin?) and erythrocytes in various stages of 

 disintegration. Endoplasm also contains gemmules, each composed of 

 outer layer and finely granular central portion. Size varies greatly: up to 

 575/i by 90m. 



Spore: Spherical. Sutural ridge well marked. Polar capsules large 

 and spherical. Sporoplasm forms a rounded granular mass. Dimensions: 

 diameter 15/z, diameter of polar capsules A.Sn, length of polar filament 

 27 to 35ju. 



