

> 



THE MYXOSPORIDIA OF THE BEAUFORT REGION. 223 



Leptotheca lobosa, n. sp. (PI. ,xvi, fig. 9, 10; pi. xvii, fig. 11.) 



Trophozoite. — Vegetative trophozoites colorless, transparent to translucent; usually spherical (fig. 9), 

 but may form a large rounded pseudopodium of ectoplasm (fig. 10). Amoeboid movements very slow. 

 Ectoplasm remarkable for its coarsely granular structure, the granules being very distinct and of uniform 

 size. In roimded individuals the ectoplasm forms a distinct peripheral layer around the entire tropho- 

 zoite (fig. 9). Endoplasm less granular and more transparent than extoplasm, containing numerous 

 large, yellow, fat globules, which average larger and are more abundant in large trophozoites. Several 

 denser sporoblast cells can often be indistinctly seen. 



Diameter of rounded vegetative trophozoites up to 24m. 



Disporous. 



Spore. — Elliptical when viewed from above; valves slightly tapering but rarely exactly alike. 

 Sutural line forming a prominent, sinuous ridge around spore. Capsules and capsulogenous cells dis- 

 tinct; capsules opening at some distance from the capsular margin. Sporoplasm distinct, nearly filling 

 both valves. Even after being freed from the mother trophozoite the postcapsular sides of the spores 

 remain united at the sutiu'al line. This seems to be very characteristic and has been observed in no 

 other species. 



Length of sjwres i6-i8|ix, width 9-10^; diameter of capsules 3m. 



Habitat. — Foimd in the urinary bladder of one individual of Paralichihys dentatus taken July 25, 

 1914. 



Remarks. — In its general form the spore approaches that of Ceratomyxa, but on the whole seems to 

 show more of the characteristics of Leptotheca. The trophozoites exhibit characteristics which are 

 much more common in Leptotheca than in Ceratomyxa. 



Leptotheca glomerosa, n. sp. (PI. xvu, fig. 12, 13.) 



Trophozoite. — Vegetative trophozoites colorless, transparent; roimded or somewhat irregular in 

 shape, with short, lobose pseudopodia. AmcEboid movements slow. Ectoplasm forming a distinct, 

 hyaline layer around entire trophozoite. Endoplasm finely granular, with numerous small fat globules 

 varying greatly in size. Almost the entire trophozoite is used up in the formation of the spores (fig. 

 12) and the ectoplasmic layer is no longer distinguishable. 



Diameter of rounded sporulating trophozoites about ii^i. 



Disporous. 



Spore. — Approximately cylindrical; valves rounded at ends (fig. 13). Capsules distinct. Coiled 

 filaments not visible. Sutural plane at right angles to longitudinal axis. Sporoplasm finely granular 

 and completely filling cavity of sporocyst. 



Length of spore g^, width 4.5^1; diameter of capsules 2/i. 



Habitat. — Occtu-s occasionally in the urinary bladder of Paralichthys albiguttus. Not common. 



Genus CERATOMYXA Thelohan. 



Ceratomyxa mesospora, n. sp. (PI. xvn, fig. 14-16.) 



Trophozoite. — Vegetative trophozoites colorless, pyriform, elongate, with long, slender posterior 

 process. Numerous filiform pseudopodia at anterior end. Progressive movements rapid. No sharp 

 demarcation between ectoplasm and endoplasm. Endoplasm finely granular and filled with small, 

 colorless, homogeneous spherules (fig. 14). Spherules absent at extreme anterior end, where the 

 endoplasm is denser and more granular. After being on the slide for a short time vegetative tropho- 

 zoites become rounded and motionless, but on account of the great length of the spores trophozoites 

 containing well-developed spores are unable to contract in this manner. 



Length of full-grown trophozoites varies within wide limits according to degree of attenuation. 

 Total length of trophozoites about 70-85M, length exclusive of posterior process about 50-7 5m, width 

 about 2 0-2 5m. 



Disporous. 



Spore. — Greatly elongate along longitudinal axis, each valve forming a slightly tapering cone more 

 or less rounded at the apex (fig. 15, 16). Valves not compressed. Sutural plane forming an acute 

 angle with longitudinal axis. Capsules conspicuous. Coiled filaments very distinct. Capsules are 

 remarkable in that they are imsymmetrically situated, one capsule being always located in the widest 

 part of the spore, the other being a little to one side (fig. 15). The capsule situated in the middle 

 of spore is usually slightly larger than the other. Sporoplasm unsymmetrically situated, sometimes 

 being entirely confined to the larger valve. 



