304 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



, Plate 46. 



Figs. 1-3. Myridium Ueberkiihnii. 



1. E]>itlielial infection of bladder from fresh and also from hrematoxylin-stained 



ni;itori;il {-.xt'tov PfoilVer. X 1). 



la. 'I'o the left lit'altliy, to the rifrlit slightly hypertrophicd epithelia which have 

 lost their nuclei. At the riglit border, monstrously enlarged epithelia, or 

 rather myxosjioridia, with fat anil ha'inatoidin contents; nncleu.s ohscuri;. 

 Below to the left an isolated epithelial cell with early infection, and the 

 disrnpted epithelial nucleus. 



Ifc. IiiiMiigration of young myxosporidia into tliered blood corpuscles of Lucius 

 luciii.'i. Nucleus, where preserved, dark. In the u])per row the middle cor- 

 pusclt! shows a nuiltipli" infection. J.ower row shdwiui; not sjxue formation, 

 but fat globules, uu<-lei, and ha'iiiatoidiu crystals. Iji tlie lower right-hand 

 figure Ihe myxosporidium has left the blood corpuscle and developed its 

 hyaline ectoplasm. 



2. Myxosporidia (after IJalbiani. X 1). 



2a. Myxosporidium (illed with fatty granules without pansporoblasts. 

 2b. Myxos])oridium with well-developed spores. 

 2c, (I. Very young myxosj)oridia. 



3. Pansporoblast containing 2 mature spores (after J.ieberkiihn. X i). 



Plate 47. 



Figs. 1-5. Myridium licherkiilmii. 



1. Spore formation (after Biitschli. X 1). 

 la. Pansporoblast with nuclei. 



lb. The pansporoblast has contracted its bulk somewhat, elongated to an oval, 



an<l oriented its nuclei preliminary to division. 

 Ic. The sexanucleate pansporoblast has divided into 2 spherical trinucleate 



s.|)oroblasts. 

 \d. The sporoblasts have elongated and oriented themselves and their nuclei. 

 Ic,/. Showing the develo]nnent of the capsules independently of the vanishing 



terminal nuclei. In the center of the spore its nucleus (see p. 287). 



2. Developed spore (after Lieberkiihn. X §). X 900. 



3. Mature spore (after Biitschli. X 1). Showing outline, bilateral symmetry, 



capsules, sporoplasm, and nucleus (see p. 287). 



4. The same (after Jialbiani. X 1). 



4a, /(. Most common Ibrm of spores with 1 capsule in each wing; h, with fila- 

 ments extruded. 

 4c. Rarer form of spore with 2 capsules in each wing. 



5. Si)ore with filaments extruded (after liiitschli. X 1). 



Fig. 6. Myxidium 1 tip. 102. Showing spore with capsules separated (? iu each wing.) 

 (After Leydig. X t). 



