THE MYXOSPORIDIA, OR t»SOROSPERMS OF FISHES. 299 



Plate 28 — Continued. 



Fig. o.* Myxoiohis cycloides (iiftov MnWev. X 1). X 1. 



5a. Group of cysts, iwtural size. 



od. Vertical view of broad form. 



5c. Transverse view of same. 



5/. Vertical view of elongate form. 



5y. Transverse view of same. 

 Fig. 6. Mijxoholus sp. 61 (after Miiller. X 1). 



6n. Vertical view of spores. 



6h. Transverse view. 



6c. Rare aberrant form among the remaining normal forms in tlie same cyst. 



6d. Pansporoblasts with 2 s])ores. 



6c. Rare forms of pansporoblast containing 3 spores. 



6/. A rare method of grouping of 3 spores. 



6g. Spores with pnnctate borders [illusion due to the simultaneous presence in 

 (approximate) focus of the supero-antcrior and infero-anterior borders of 

 the sporoplasm]. 



6h. Spore with developing germs (see p. 2J0). 



6/, A'. Rare spores with 3 "vesicles."' 



6/. Rare form; seen only once. 

 Fig. 7. Myxoholus obesus (after Balbiani. Xf ). 



7a. Vertical view of spore, showing pericornual nuclei. 



7b. Vertical view of spore, showing capsules witli lilainents extruded, and the 

 sporoplasm with its cornua, and the supero- and infero-anterior margins. 



Plate 29. 



Fig. la-d. Mi/xohohis IratisoraUs (original), 



la-c. Vertical view showing outline, capsules, sporoplasm, vacuole, and nuclei. 

 Hydrochloric acid alcohol carmine. 



Id. Transverse view showing equal convexity of valves, and the narrow ridge. 

 Figs. 2-7. Mi/xobol us f merlacii (a,iter Perng'ia. x 1). 



2-6. Various forms of the myxosiioridinm; showing also the spores. 



7. Two spores making their exit from the myxosporidium. 

 Fig. 8. Myxobolus sp. 67 (after v. d. JBorne. X 1). 



8rt. Group of spores. 



86. Leucisciis rutUtis with the myxosiioridian tumors. 



Plate 30. 



Fig. la-q. Afyxoholnn cf. crepTnil showing different views of spores (after Weltner. 

 X 1). n-p, X .528; (/, X 720. All were drawn with Al)be camera; m, ii, are 

 optical sections at the level of posterior end of capsules; <r, separate caj)- 

 sules; one dull and with filament still coiled; the other transparent with 

 filament extruded. 



Plate 31. 



Fig. la-e. Myxobohts ?? zscltolikei (after Zschokke, Schieclc Oc. 2, Obj. 7. X f). 

 Vertical views of spores with extruded "tails"; also the capsules (?). 



Fig. 2. Myxobolm meditis and Chloromyxiim elegans. Section of tube of kidney of 

 Pyt/osteus puiu/itius, showing spores of the two species surrounded l)y epi- 

 thelium of tube. Borax carmine and gentian violet (after Thdlohan. 

 X 1). 



Fig. 3. Myxobolus medius (original enlargement from preceding. X about 4). 



Fig. 4. Myxobolus medius. Spore in pansporoblast (after Th61ohan. X 1). 



Fig. 5. Myxobolus strorif/yhiriis (niter Muller. X 1). 

 5a. Vertical view. 

 5b. Transverse view. 



* For b and c, see Ohloromyxum dujardini, plate 40, flg. 4. 



