363] STUDIES ON MYXOSPORIDIA—KUDO 125 



MYXOSOMA FUNDULI Kudo 

 [Figs. 344 to 347] 

 1918 Myxosoma funduH Kudo 1918 : 12-14 



Habitat: Branchiae of Fundulus majalis Wal. and F. heteroclitus L; 

 Woods Hole (August, September). 



Vegetative form: Cysts. Spherical and small; 150ju in average diame- 

 ter. Largest form observed 360/x by 264ju. Spores, young and mature, 

 were found in the cysts. Polysporous. 



Spore: Pyriform. Shell uniformly thick with 7 to 10 folds on sutural 

 edge at the posterior portion. Sutural ridge, fairly well marked. Two 

 polar capsules pyriform and of equal size at the anterior end. Sporoplasm 

 finely granular with two nuclei but without any iodinophilous vacuole. 

 Dimensions: length 14ju, breadth 8/i, thickness 6)Lt, polar capsule 8/i by l^i, 

 length of polar filament 38 to 42/* (perhydrol, KOH). 



Remarks: The writer could not find any evidence of an iodinophilous 

 vacuole by treatment with various iodine mixtures, which is the most 

 important characteristic of the genus. Hahn's form (Myxobolus fundidi, 

 p. 151) should be distinguished from the present form. 



Genus LENTOSPORA Plehn 

 1905 Lentospora Plehn 1905 : 150 



The characters of the genus are described on page 58. 

 Type species: Lentospora cerebralis (Hofer) Plehn. . 



LENTOSPORA CEREBRALIS (Hofer) Plehn 

 [Figs. 349 to 354] 



Habitat: Cartilage and perichondrium of TruUa iridea Gibb., Salmo 

 fontinalis Mitch., TruUa salar L.; Germany (Karlsruhe and other localities). 



Vegetative form: Ameboid form. Size varies greatly. Small ameboid 

 form probably grows up into large individual which has often fifty or more 

 ringform nuclei and breaks up into numerous small forms by division. No 

 sporous character is observed except a figure of a disporous form. 



Spore: Circular in front view; lenticular in side view, with more or less 

 extensive variation in length and breadth. Shell smooth. Sutural ridge 

 distinctly thickened. Two polar capsules pyriform and convergent, are 

 usually of same size. Extruded polar filaments cross each other. Sporo- 

 plasm with two ring-form nuclei but without any iodinophilous vacuole. 



