311] STUDIES ON MYXOSPORIDIA—KUDO 73 



Vegetative form: Polymorphous. Elongated with same breadth or 

 tapering to one end; club-shaped with roundish enlargements. Young 

 trophozoites spherical or pyriform. Pseudopodia long and narrow or 

 broad and bi- or multi-lobate. Body colorless both in the young and the 

 adult. Protoplasm homogeneous and finely granular. Disporous and 

 polysporous. Spores are found inside of the endoplasm and in the roundish 

 buds, ordinarily two spores being formed in each bud. Number of buds 

 on one trophozoite varies. Plasmotomy by budding and division. 



Spore: Elongated elliptic. Polar capsules spherical and large. Sutural 

 plane cuts the spore into exactly equal two parts. Two nuclei in sporoplasm 

 are rather small and are always in one of the shell-valves. Dimensions 

 not given. 



Remark: The form, mentioned by Jameson in the same seat, host and 

 locality, that "has something of the appearance of a Leptotheca" and that 

 is also "almost certainly neither of the two Myxosporidia — Ceratomyxa 

 pallida and Henneguya neapolitana . . . ," is probably identical with the 

 present form. 



CERATOMYXA MESOSPORA Davis 



[Fig. 50] 

 1917 Ceratomyxa mesospora Davis 1917 : 223-224 



Habitat: Gall-bladder of Cestr acton zygaena, C. tiburo; Beaufort (July). 



Vegetative form: Pyriform, elongate, with long, slender posterior 

 process. Numerous filiform pseudopodia at anterior end. Progressive 

 movements rapid. Body colorless. No sharp demarcation between 

 ectoplasm and endoplasm. Endoplasm finely granular and filled with 

 small, colorless, homogeneous spherules. Spherules absent at anterior end. 

 Size: total length 70 to 85/i, length exclusive of posterior process 50 to 75ju, 

 breadth 20 to 25^. Disporous. 



Spore: Greatly elongate, each valve forming a slightly tapering cone, 

 rounded at the apex. Valves not compressed. Sutural plane forming an 

 acute angle with the longest diameter. Polar capsules conspicuous. Coiled 

 polar filaments very distinct. Polar capsules are remarkable in that they 

 are asymmetrically situated, one being always located in the widest part 

 of the spore, while the other being a little to one side. Sporoplasm asym- 

 metrically situated, sometimes being entirely confined to the larger valve. 

 Dimensions: breadth 50 to 65ju, sutural diameter about Sn, diameter of 

 polar capsule 4.5ju, length of polar filament 90fx. 



Remarks: Similar to C. sphaerulosa Thel. and occurs with C. recurvata 

 Davis in the same organ. 



CERATOMYXA SPHAIROPHORA Davis 

 [Fig. 51] 

 1917 Ceratomyxa sphairophora Davis 1917 : 224 



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



