THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. 291 
EXPLANATION OF PLATES, 
All figures copied are either of the same size as, or 14 times the size of, the figures 
from which they were copied; that is, in copying only 2 ratios were used, 1:1 and 
#:1. The relative sizes of the copied and the original figures are in every case 
indicated by the figures within the parentheses. All figures outside the parentheses 
indicate the total amplification from the specimens. For the derivation of any tigure, 
see table, pp. 131-134. 
PLATE 1. 
Figs. 1-4. Psorospermia sciene-uwmbre (after Robin. xX $). 
la. The convoluted string (cordon enroulé). X 14. 
1b. Section of fig.la. xX 14. 
2. Cells of variety 1. x 600. 
8. Cells of variety 2. x 600. 
4. Operculate cells of variety 3. x 600. 
IPA R es 
Figs. 1-2. Lithocystis schneideri (after Cuénot. X $). 
1. Gregarine stage, with voluminous nucleus and clinorhombie crystals. 
2a. Spore at the extremity of the tube, showing the truncated distal ava. 
rounded proximal extremities, and the sporozoites in course of formation. 
2b. Fully developed spore containing 8 sporozoites. 
Fig. 3. Genus incert. sp. 3 (atter Miiller & Retzius. X 2). Spores from the diseaseé 
air bladder of Gadus morrhua. 
PLATE 3. 
Figs. 1-5. Balbiania rileyi (after Stiles. Xx 1). 
. A portion of the pectoral muscles of Anas boschas in the condition known as 
“measly duck.” 
. Longitudinal section of parasite (greatly enlarged). 
. Transverse section (greatly enlarged): ct, connective tissue cyst with nunier- 
ous nuclei; cu, cuticle of the parasite; m, sections of muscle. 
. Microtome section of meshes containing falciform bodies greatly enlarged. 
. Falciform bodies: a, stained, showing nucleus and vacuole; b, unstained. 
—_— 
oF Wh 
PLATE 4, 
Fig. la-m. Genus incert sp. 4 (after Valentin. x #). 
la. The original globular form. 
1b-d. Different stages of the unrolling of the tail. 
le. A globule in which the separate dark granules appear to be inclosed in ~.wa- 
rate peduncles. 
1f. Peduncle ideally enlarged. < 
1lg-m. Various forms of the developed animal. 
Figs. 2-8. Genus incert. sp. 6 (after Schewiakoff. x 1). 
2. Amcebiform stage. x 1500. 
3-5. Enecystment. x 1500. 
6. Cyst with 6 spores. x 1500. 
7. Cyst thickly filled with spores. » 1500. 
8. Plasmode proceeding from the fusion of 3 amebx. xX 1500. 
