THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. 297 



Plate 22. 



Vis^s. ^-3. Mi/xoholus eUipsnidcs? (nftcTFfei&eT. X 1). « 



" 1, 2. Spores from tho gall lihuldtir of Tinea iinca. 



3. Sjxires from the air bladder of T. tinea. 

 Fig. 4rt, h. Mfixohohis sp. 50 (after Leuckart. X 1). 



4«. Vertical view of spore. 



•16. Transverse view of spore. 

 Figs. 5, 6. Myioholns sp. .51 (alter Pfeift'er. X 1). 



5. Myxosporidian infection of Barhits harhus. 



6. Tumors of muscle. 



Plate 23. 



Figs. 1-2. Myxohohis sp. 51. Mj'xosporidian infection of i?ar7)Ms 7mr&«8 (after Pfeif- 

 fer. X 1). 



1. From a photomicrograph. 



2. Infection of the muscle cells and the iuterfibrillar connective tissue. 



2a. General immigration of myxosporidian spores into muscle with degenera- 

 tion of the neighboring parts of the muscle and with beginning of incapsul- 

 iug on the part of the host. 



26. Split spores. To the left, the exit of the sporoplasm; to the right, empty 

 shells undergoing solution. 



2c. The myxosporidium (sporoplasm) in the first stages of growth; on the right 

 the same, after hardening and hiematoxylin. 



2d. Next growth-stage of myxosporidium; adhesion of individuals to a "sorus." 



Plate 24. 



Figs. 1, 2. Myxolohis sp. 51 (after Pfeifi'cr. X 1). 



la-h. Sections of muscles of Barbas Ixirbiis, showing myxosporidian cysts, spores, 



etc. For details, see Bibliography, Lxxn. p. 127. 

 2a. A large muscle cell of abdominal wall beaded by myxosporidian cysts; the 



transverse striation and the substance of the muscle has disappeared. Size 



of cysts. Variable; contents, spores. X 100. 

 26. Fragment of muscle cell. Showing 5 spore cysts. Between the upper and 



the next to the upper cysts lie 7 spores in the muscle cell (supplementary 



immigration ?). X 100. 

 2c. Fragment of another muscle cell with 6 cysts. The upper 2 with maturt 



spores; between them 6 spores, whose capsules lack the obliiiue striatioi 



(filaments extruded ?). The third cyst with the contents divided into pan. 



sporoblasts, in which as yet no spores are A'isible. The fourth and fifth 



(from above) showing nuclei, surrounding dancing granules, and a hyaliiw 



ectoplasm; both are inclosed in a mesh of the original muscle cell. X 400 

 2(1. Myxosporidium free in the interfibrillar connective tissue. X 750. 

 2c. Mature spore. X 750. 



Plate 25. 



Figs 1-6. Myrohohis sp. Bl. 



1 a-h. (irou]) of s])oreH, most of them viewed vertically (after M<5gnin. X i). 



16. Spore with lilaments extruded. 



Ic. Isolated caiisules. 



Id. Same, with extruded filaiucnt. 



le. Spores viewed transversely. 



If-h. Spores apparently imbedded in the myxosporidium. 



2. Showing a, vertical, and 6, transverse views of spore, and c, .a transversa riew 



of a separated valve (after Ludwig. X 1). X 2000. 



3. Spore viewed vertically (after Pfeitter. x 1). 



4. Isolated myxosporidium, showing spore formation (after PfeiflVr, Y 1). 



5. Spores and the extruded amceboid Mporo])lasm (aftSr Pfeitl'or. X 1). 



5a. Vertical view, showing one capsule with filament extruded, spicoplasm, 



-vacuole, and 3 refiingent bodies of undetermined siguificauco. 

 56. Transverse view of spore showing ridge. 

 5c. Sporoplasm, after exit, iu various locomotive stages. 



6. Spores, showing filaments extruded, and 9por()i)lasni in tho ac>. of, and after 



exit, ajjpareutly also the vacuole (after Pfcifier. X 1). X 1/X). 



