296 REPORT OF THE COMMISSIONER OP FISH AND FISHERIES. 



Plate 19. 



Fig. 1. Myxflhnlus hicosUiliis (after Lieberkiihn in Riitsolili. X ?). Vertioal view of 

 spore showing the 2 oblique ridges on the shell, the capsules, and the 

 sporoplasiu. 

 Figs. 2-8. Miixohohis eUipsoidcs. 



2, 8. I'leitl'cr's copies of figs, la, lb of ])late 20 (X 1). 



4. Mesenteric artery of Tinea tinea with sessile or peduncnlate cysts developed 



at the expense of the connective tissue (-oat of the vessel. Cyst contents 

 myxosporiilia, ahine or with imbedded brown (hajmatoidin-colored) gran- 

 nlar matter (aiter Halbiani. X 1). 



5. Section of diseased air bladder of T. tinea, showing spores and, at the left-hand 



margin, the internal epithelial surface of the air bladder. Borax carmine, 

 gentian violet (after Theloiian. Xl). 



6. Section of cyst of branchiie of T. tinea; showing in order, from above down- 



ward, the braiH'hial epithidiiini, cyst membrane, myxojjlasm, si)<)res, and the 

 nuclei of the last. Picro-carmine and gentian violet (after Thc^lohan. X !)• 



7. Transverse section of air bladder; carnune, celloidin (after Pfeitfer. X 1). 



X 100. 



8. Portion of rig. 7 (after Pfeiffer. x 1). X 400. On the wall of the cyst the 



younger, still uninuclear, parasites; to the right triuucleate sporoblasts. 



Plate 20. 



Figs. 1-4. ^fyroholnH rlUpKoirJcs. 



la-c. Myxos])oriilinm and cyst from fins of Tinea tinea, with spores in course of 

 development (after J^albiaiii. X 1). 



Irt. Small myxosporidium containing only nuclei. 



1^. More advanced stage. 



Ic. Large encysted myxosporidium containing numerous spores, mostly mature. 



2a-c. Three stages in spore formation, showing paired deveiopmeut of 8]iores in 

 a mass of homogeneous ])lasma, and the spores contained at maturity in a 

 vesicle (after Balbiani. X ?). 



3a-c. Spores from air bladder of T. <(jica showing ribbons (after Balbiani. x 3). 



3a, 6. Spores united by the ribbons, the sporoplasm rolled into a ball, and the 

 "accessory" capsules. 



3c. Isolated spore with extended ribbons; capsules empty; sporoplasm in a ball. 



4a-e. Spores from the air bladder of T. tinea, showing different stages of devel- 

 opment of the nuclei ; carmine, gentian violet (after Th(Slohan. X 1). 



4a. Spore with 1 uu(d(ui8. 



4?). Spore witii 2 nuclei. , 



4c. Spore with 3 nuclei. 



id, e. Spores with 4 nuclei. 



Plate 21. 



Figs. 1, 2. Mji.roholus elUpsoides. 



la-h. (After Balbiani. X i).) 



la. Vertical view of spore, showing pericornual nuclei and anteriorly a 

 "globule." 



lb. Transverse view, showing the equ.al convexity of the valves and the equality 

 of the two ends of the spore. 



Ic. Vertical view of spore, showing capsules witli tilaments extruded, pericornual 

 nuclei, anteriorly a "globuh;," and jiosteriorly the sporoplasm (? contracted 

 under the action of reagents). 



1^/. Spore in vertical view, showing ribbons, and sporoplasm in act of exit. 



Ic. Capsule with filament coiled. 



If-h. 1 "'ifterent degrees of extrusion of iilamcnt. 



2a-e. Sporoplasm after exit, showing changes of form (after Balbiani. X f ). 

 H, "nucleus" [? vacuole]. 

 Fig. 3. "Degenerate processes of the spores of Tinea tinea with 3, with 2 approxi- 

 mated, with 1 capsule, with caudiform drawing out of one pole, with 

 approximation to the sarcosporidian germs. The same are found in the gall 

 bladder of the tench and in aneurisms on the splenic artery " ( after Pfeill'er. 

 X 1 ). X 1000. 

 d. Myxobolns elJipsoides (apparently; remainder indeterminate). 

 Fig. 4a-^. Myxobolus eUipnoides?? "Spores inclosed iu a cell [?pan8poroblast] mem- 

 brane becoming stained at the moment of birth, with eosin" (after and 

 jideYiV\\\GV. X 1). X 700. 

 Fig. 5. Alyxobohix cUipsoides. "Matun; spore, with band-like connection of shell, and 

 with vacuole at place of expelled germ" (after and_/ide Pfeiffer. X 1). X 7y0. 



