435] STUDIES ON MYXOSPORIDIA—KUDO 197 



APPENDIX: NEW MYXOSPORIDIA FROM AUSTRALIA 



The following six species described by Johnston and Bancroft did not 

 reach the wtiter until the page proof was read. For this reason they could 

 not be put in the text and are recorded here separately, 



MYXIDIUM THERAPON Johnston et Bancroft 

 1919 Myxidium therapon Johnston and Bancroft 1919 : 520-521 



Habitat: In the gall bladder of Therapon carho and Th. hillii; Thomson 

 River at Longreach, Australia. 



The parasite occurred in one specimen of the former host fish and in 

 nine out of thirteen specimens of the latter. No visible effect of the infec- 

 tion on the part of the host fish was recognized. 



Vegetative form: Body pale yellowish to green in color. Form(?). 

 Size varies from 3 to 12mm. in diameter. The protoplasm is differentiated 

 into a clear narrow ectoplasm, about 10/i in width, and a coarsely grained 

 endoplasm. No movements could be seen on slides; but undulations were 

 observed to travel round the margin of the trophozoite. Polysporous. 



Spore: Spindle-shaped with slightly pointed extremities. Polar cap- 

 sules are more or less rounded. Shell with faintly marked longitudinal 

 stria tion. The sporoplasm is binucleated. Average dimensions: length 

 9 to 10m, breadth 4/x, polar capsules 2 to 3/i by 1 to 2/x. 



MYXOSOMA OGILBYI Johnston et Bancroft 

 1919 Myxosoma ogilbyi Johnston and Bancroft 1919 : 521-522 



Habitat: In the fibrous tissue of the gill arch of Plectroplites amhiguus; 

 Thomson River at Longreach, Australia. Three out of nine host specimens 

 examined showed the infection. 



Vegetative form: The parasite forms white cysts usually close to the 

 bases of the gill filaments. Cysts are small and rounded, being less than 

 1mm. in diameter. The authors simply mention that sections revealed the 

 structure usually present in a Myxosporidian cyst. 



Spore : Oval with pointed anterior end. The inner margin of the shell 

 is indented posteriad. The sporoplasm contains a single nucleus, but not 

 any iodinophilous vacuole. Average dimensions: length 11 to 13ju, breadth 

 6 to 2>ix, thickness 5/x, polar capsules 5 to 6/i by 2n. 



MYXOBOLUS PLECTROPLITES Johnston et Bancroft 



1919 Myxobolus plectroplites Johnston and Bancroft 1919 : 522-523 



Habitat: In the kidney and gall-bladder of Plectroplites amhiguus; 

 Thomson River at Longreach, Australia. The parasite was observed in 



