THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. 297 
PLATE 22. 
Figs. 1-3. Myzxobolus ellipsoides? (after Pfeiffer. X 1). 
1,2. Spores from the gall bladder of Tinea tinca. 
3. Spores from the air bladder of T. tinca. 
Fig. 4a, b. Myxobolus sp. 50 (after Leuckart. X 1). 
4a. Vertical view of spore. 
4b. Transverse view of spore. 
Figs. 5,6. Myxobolus sp. 51 (after Pfeiffer. xX 1). 
5. Myxosporidian infection of Barbus barbus. 
6. ‘Tumors of muscle. 
PLATE 23. ; 
Figs. 1-2. Myxobolus sp. 51. Myxosporidian infection of Barbus barbus (after Pfeif- 
fenced) 
1. From a photomicrograph. 
2. Infection of the muscle cells and the interfibrillar 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- 
ing on the part of the host. - 
2b. 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 hematoxylin. 
2d. Next growth-stage of myxosporidium; adhesion of individuals to a ‘‘sorus.” 
PLateE 24, 
Figs. 1,2. Myzxobolus sp. 51 (after Pfeiffer. X 1). 
la-h. Sections of muscles of Barbus barbus, showing myxosporidian cysts, spores, 
ete. For details, see Bibliography, LXXx11. 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. 
2b. 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 ?). Xx 100. 
2c. Fragment of another muscle cell with 6 cysts. The upper 2 with matur 
spores; between them 6 spores, whose capsules lack the oblique striatior 
(filaments extruded ?). The third cyst with the contents divided into pan. 
sporoblasts, in which as yet no spores are visible. The fourth and fifth 
(from above) showing nuclei, surrounding dancing granules, and a hyaline 
ectoplasm; both are inclosed in a mesh of the original muscle cell. x 400 
2d. Myxosporidium free in the interfibrillar connective tissue. X 750. 
2e. Mature spore. X 750. 
PLATE 25. 
Figs 1-6. Myzxobolus sp. 51. 
1 a-h. Group of spores, most of them viewed vertically (after Mégnin. X 3), 
1b. Spore with filaments extruded. 
le. Isolated capsules. 
1d. Same, with extruded filament. 
le. Spores viewed transversely. 
1f-h. Spores apparently imbedded in the myxosporidium. 
2. Showing a, vertical, and b, transverse views of spore, and c, a transverse riew 
of a separated valve (after Ludwig. x1). X 2000. 
8. Spore viewed vertically (after Pfeitfer. ~X 1). 
4, Isolated myxosporidium, showing spore formation (after Pfeiffer, Y 1). 
5. Spores and the extruded ameeboid sporoplasm (after Pfeiffer. x 1). 
5a.Vertical view, showing one capsule with filament extruded, speroplasm, 
vacuole, and 3 refringent bodies of undetermined significance, © 
5b. Transverse view of spore showing ridge. 
5e. Sporoplasm, after exit, in various locomotive stages. 
6. Spores, showing filaments extruded, and sporoplasm in the act of, and after 
exit, apparently also the vacuole (after Pfeiffer. x1). Xx 1/0, 
