THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. 301 
PLATE 36. 
la. Showing cyst contents, consisting of spores and finely granular matter. 
1b. Individual spores. 
le. Aberrant spores seen only once among the contents of a cyst. 
1d. Group of spores; vertical and transverse views. 
Fig. 2. Myzobolus linearis. Group of spores showing the narrow outline and the 
single and double tails (after Miiller. x1). 
Fig.3. Myxobolus sp. 61. Rare forms of spores reproduced among tailed forms, 
from plate 28, fig. 6. 
Fig.4. Myxobolus diplurus (after Lieberkiihn in Biitschli. Xx $). Xx about 1050. 
Vertical view showing posterior position of capsules and double tail. 
Fig. 1. Myxobolus schizurus (after Miiller. x 1). 
PLATE 37. 
Fig. la-f. Chloromyxum incisum (after Leydig. X 1). 
la. Myxosporidium without pansporoblasts. 
1b. Same with 1 pansporoblast, but no spores. 
1c, d. Same with sporoblasts. 
le, f. Same with fully developed spores showing the crenate posterior border. 
Fig. 2-7. Chloromyxum leydigii (after Perugia. X 1). 
2. The myxosporidium. 
3. The same, containing numerous spores. 
4. The same, giving exit to 3 monosporophorous pansporoblasts. 
5, 6. Pansporoblasts with spores; in fig. 5 the spores with 4 capsules, 
7. Spore giving exit to the sporoplasm. 
PLATE 38. 
Figs. 1, 2. Chloromyrum leydigii (after Leydig.  X #). 
1. From gall bladder of Raja batis. 
1a, ad. Myxosporidia of various sizes without pansporoblasts. 
1b, e. Myxosporidia, showing (b) pansporoblasts and various stages in spore 
formation; also outline of spore. 
1f. Longitudinal (‘‘end”) view of spore, showing the 4 capsules. 
2a-c. From gall bladder of Squalus acanthias. Myxosporidia without pansporo- 
blasts. 
PLATE 39. 
Figs. 1-3. Chloromyxum leydigii. 
1. Myxosporidia from gall bladder of Torpedo torpedo (after Leydig. x $). 
la. Without pansporoblasts. 
1b. With pansporoblasts and spores. 
1c. With pansporoblast and sporoblast. 
2a-b. Myxosporidia from gall bladder of Scylliorhinus canicula (after Leydig. 
xX $). 
2a,,a.. Myxosporidia without pansporoblasts. 
2b. Myxosporidium with 12 pansporoblasts, each containing 1 spore. 
3. Myxosporidium. This figure appears to be generalized from figures a, a2, of 
the preceding (after Leuckart. 1). 
Fig. 4. Chloromyxum fluviatile (atter Thélohan. x3). Vertical view showing the 
capsules in 2 lateral pairs, the nonvacuolate sporoplasm, the vertical 
position of the ridge, and the minute spines on the shell. 
Figs. 5,6. Chloromyxum mucronatum. 
5a, b. From urinary bladder of Lota lota (after Lieberkiihn. x 3). 
5a. Longitudinal view of spore, showing the 4 capsules. 
5b. Vertical view showing the mucronate anterior extremity, capsules, and 
sporoplasm. 
6. From Lota lota (after Balbiani. xX 3). 
6a. Vertical view showing capsules, pericornual nuclei, and vertical position of 
the ridge. 
6b. The same; also beginning of valve separation. 
6c. The same; also corkscrew extrusion of tilaments, 
