361] STUDIES ON MYXOSPORIDIA—KUDO 123 



ZSCHOKKELLA ACHEILOGNATHI Kudo 

 [Figs. 334 to 338] 



1916 Zschokkella acheUognathi Kudo 1916 : 3-5 



Habitat: Gall-bladder and gall-duct of Acheilognathus lanceolatum 

 Temm. et Schl.; Tokio (May). Over 80% of the fish examined were 

 found to be infected. 



Vegetative form: Disc-shape. In bile duct, large trophozoites are 

 folded up. Body colorless and transparent. Protoplasm is well defined 

 into two regions. Ectoplasm finely granular in vivo. In stained sections, 

 it shows two layers; thin outer layer (2/x thick) presents very fine striations, 

 while inner layer (6 to 8/i thick) is finely vacuolated without any enclosure. 

 Endoplasm is highly vacuolated. Lobose pseudopodia formed only in 

 younger individuals (15 to 30/i in diameter), in which ameboid movements 

 are not slow. Size: up to 720/i by 550ju, thickness 5 to 30/i. Polysporous. 



Spore: Form resembles Zschokkella hildae, but slightly elongated. 

 Form varies to some extent. Some spores are of Myxidium type. Sutural 

 line curved. Longitudinally striated. Spherical polar capsule at each end 

 opening near the extremity. Dimensions: length 10 to 14/*, breadth 6 to 7/x, 

 diameter of polar capsule 3 to 5/x, length of polar filament 65 to 70/i (KOH). 



ZSCHOKKELLA GLOBULOSA Davis 

 [Figs. 339 and 340] 



1917 Zschokkella globulosa Davis 1917 : 236 



Habitat: Urinary bladder of Spheroides maculalus; Beaufort (August). 



Vegetative form: Rounded; slowly ameboid, forming short, lobose 

 pseudopodia. Body colorless and transparent. Ectoplasm not distinct. 

 Protoplasm granular, characterized by the presence of several large fat 

 globules. Sporulating trophozoites about 15 to 16/x in diameter. Mono- 

 sporous and disporous. 



Spore: Semicircular. Sutural line twisted on its axis and oblique to 

 longitudinal axis; sutural ridge distinct. Polar capsules opening on flat 

 surface. Sporoplasm finely granular and very transparent. Dimensions: 

 length 11/x, breadth 7/t, diameter of polar capsules 3/i. 



Family MYXOSOMATIDAE Poche 

 1913 Myxosomatidae Poche 1913 : 230 



The characters of the family are described on page 58. 



Genus MYXOSOMA Thelohan 



1892 Myxosoma Th61ohan 1892 : 175 



The characters of the genus are described on page 58. 

 Type species: Myxosoma dujardini Thelohan. 



