290 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
Spore.—Possessing only one plane of symmetry, viz, the valve- 
junction plane, differing in this respect from most other myxosporidian 
spores, Which have another such plane perpendicular to valve-junction 
plane. Form very remarkable, comparable to a pod whose acuminate 
extremities are oppositely directed; length (?),4 to5u; breadth (?), 8 to 
94. Capsules, 1 at each end (or wing?), their long axes oblique and 
oppositely directed with reference to the long (transverse?) diameter of 
the spore. Filament extrusion very difficult of production; produced 
by nitric acid; length of filament, 124; sporoplasm nonvacuolate. 
Habitat.—Gall bladders of Onus tricirratus (=Motella tricirrata), 
Syngnathus (=Hntelurus) equoreus (pipefish), and Blennius pkolis, all 
from Roscoff; in B. pholis from Concarneau; in Siphostoma (= Syngna- 
thus) acus (pipefish) and Callionymus lyra. 
The description of this species is not sufficient, in the absence of 
figures, to warrant a positive opinion as toits generic affinities. Ihave 
attempted to construct from Thélohan’s description a diagram of the 
spore, but without success. The prevalent very loose use of such terms 
as ‘“‘ends,” “extremities,” “length,” “ breadth,” ete., renders them 
invalid for taxonomy, and the only course open seems to be to retain 
this provisionally in Myxidium, noting that in its bivalve structure it 
differs markedly from M. lieberkiihnii, the type species. 
102. Myxidium? sp.incert. Pl. 47, fig. 6. 
Psorosperms of Raja batis, Leydig, 1851, Miiller’s Archiv., pp. 226, 234, pl. 8, fig. 
4g; ib., Leuckart, 1852, Archiv. f. physiolog. Heilkde., x1, p. 4386, fig. 210. 
Myzidium? sp. Gurley, 1893, Bull. U. 8. Fish Com. for 1891, x1, p. 420. 
No description. The distinctness of this form from Chloromyxum 
incisum was recognized by Leydig (p. 234). 
Habitat,—Free in bile ducts of Raja batis L, (skate), 
