\ 



The myxosporidia of the bEaufort region. 229 



of curvatrire (cf., fig. 52, 55, 56). Spores usually slightly asymmetrical, one valve being more atten- 

 uated than the other; in rare cases the valves may be practically alike. Sutural plane perpendicular to 

 longitudinal axis. Capsules large and distinct. Sporoplasm usually unsymmetrically situated. 



Length of spore 18-25^, width 5-6^1 diameter of capsules 3^1. 



Habitat. — Very abundant in the gall bladder of Peprilus alepidoius . Is usually present in large 

 numbers during June, being absent in only 5 out of 17 fish examined during this month. In July the 

 parasites were much less frequently met with. Only 3 out of 6 fishes examined during the first week 

 in July were infected, and later in the month nearly every fish examined showed no trace of this para- 

 sites. It is interesting to note that dxu-ing June only vegetative trophozoites were found in a number 

 of fishes, while in July the great majority were in late stages of sporulation and no case was found where 

 only vegetative trophozoites were present. 



This species also occurs in the gall bladder of Prionotus evolans. Both trophozoites and spores are 

 somewhat larger in P. evolans than in P. alepidoius , but in other respects there is ver>' little difference. 



Remarks. — This species is evidently very close to C. pallida Thelohan, but unfortunately his de- 

 scription is very incomplete. According to Thelohan the trophozoites of pallida are rounded, with 

 short, lobed pseudopodia, and he makes no mention of the presence of fat globules, which are charac- 

 teristic for monospora. Thelohan was also uncertain as to whether pallida is monosporous. It has, 

 therefore, seemed best to consider the species distinct, at least provisionally. 



Ceratomyxa streptospora, n. sp. (PI. xx, fig. 58-60.) 



Trophozoite. — Vegetative trophozoites colorless, transparent, pyriform; a few conical, filiform, 

 and wavelike pseudopodia at anterior end (fig. 58). Ectoplasm distinguishable only at anterior end, 

 where it forms a clear, transparent layer. Endoplasm finely granular; filled with transparent, homo- 

 geneous spherules, which show only indistinctly; a few small, fat globules usually present but never 

 abundant. 



Measurements of full-grown vegetative and sporulating trophozoites vary from 48/i long by I2;x 

 wide to 60M long by 9^ wide. 



Disporous. 



Spore. — Valves greatly elongated, compressed parallel to longitudinal plane, ends rounded (fig. 59). 

 Valves usually somewhat twisted on the longitudinal axis, so that the spores appear unsymmetrical 

 (fig. 60), due to the valves being viewed at different angles to the plane of flattening. Sutural line 

 forming a distinct ridge. Capsules large, spherical. Coiled filament not distinguishable. Sporoplasm 

 finely granular, entirely filling both valves. 



Length of spore 34-39M, width 4^1; diameter of capsules 3^- 



Habitat. — Common in the gall bladder of ChtBtodipterus faber . Large numbers were found in 8 out 

 of 9 fishes examined June 9-17. None were found in 4 fishes examined July 11-13. Very few 

 trophozoites were found floating freely in the bile, most of them being attached to the epithelium. 



Ceratomyxa aggregata, n. sp. (PI. xx, fig. 61-64.) 



Trophozoite. — Vegetative trophozoites colorless, transparent, rounded to somewhat irregular in 

 shape, rarely pyriform; slowly amoeboid. Ectoplasm not distinct from endoplasm. Endoplasm finely 

 granular, containing numbers of small fat globules, which are usually aggregated into irregular clumps. 

 Sporulating trophozoites move very slowly if at all; show a marked tendency to collect in groups com- 

 posed of a large number of individuals so closely associated that it is often impossible to make out the 

 limits of individual trophozoites. During development the distal half of each valve is so closely applied 

 to the postcapsular side of the proximal half as to be indistinguishable in the living trophozoite (fig. 62). 



Length of sporulating trophozoites about iSyu, width about 14/1. 



Disporous. 



Spore. — Crescent-shaped; valves much elongated, tapering gradually toward the ends, which are 

 strongly compressed parallel to longitudinal plane, the opposite walls often being in contact (fig. 63, 64). 

 Capsules large, approximately spherical, opaque, opening close together on the capsular side. Sporo- 

 plasm distinctly granular, usually symmetrically situated. 



Length of spore about 50^1, width 6-7^; diameter capsules 3.5m. 



Habitat. — Common in the gall bladder of Leiostomus xanthurus. Present in 14 out of 18 individuals 

 examined during July. 



Also occurs in the gall bladder of Micropogon undulatus. 



