60 
tilage was much hypertrophied, and the cysts were little 
cpaque masses about 1 mm. in diameter. The smear con- 
sists of a mass of spores, two of which are seen in 
fig. 7 (¢d); each is spherical in shape, and _ possesses 
two polar-capsules (p.c.). The spores are 8-94 in 
diameter, and the polar-filaments, many of which are 
expelled, have a length of about 70u. There are several 
refractile oil granules (g) visible, but the stain has not 
penetrated sufficiently to shew up the nuclei. I could not 
make out any vacuole in the sporoplasm which would cor- 
‘ 
respond to the ‘‘ iodinophilous vacuole” of a Mywobolus 
spore. Moreover, the length of the filament is much longer 
than is usual for this genus. Hence, although there are 
one or two JIZyeoboli with spherical spores, I am more 
inclined to place this new species in the genus Sphero- 
spora, as S. platesse, presumably polysporous, and with 
unornamented, spherical spores. 
We may, therefore, summarize the Myxosporidian 
parasites of flat-fish as follows :— 
Host. Organ or Tissue. Parasite. 
Plewronectes flesus| Gut-walland | Glugea stephani, 
(flounder). mesentery. | Hagenm. 
P. platessa (plaice). Gut-wall. 1 Doe do. 
Do. do. |  Otic-capsule. Sphaerospora 
| platess@, Nn. sp. 
| -y . 
?seudopleuronectes Gut-wall. |  G. stephana, 
americanus | Hagenm. 
(winter flounder). | 
Rhombus | Liver. Pleistophora sp. 
(= Stromateus) | (probably n. sp.). 
triacanthus (the | | 
butter-fish). | 
