116 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
3. Spherospora and Myxosoma do not differ at all in the characters 
given (the distinction between these unispecific genera resting solely 
upon the outline of the spore), and the two taken together present only 
a single character in contrast to Chloromyxum, viz, the number of the 
capsules. They may therefore be fused as a subgenus of Chloromyxum. 
4. Oeratomyxa agrees sufficiently closely with Chloromyxum to permit 
its reference to the Chloromyxide. 
5, Cystodiscus is certainly entitled to separate family rank. To it may 
be provisionally approximated Sphwromeya, it having the capsules in 
two groups and a bivalve shell. (Compare carefully p. 278.) 
6. Myxidium must form the type of a separate family, the entirely 
different position and grouping of the capsules forbidding its reference 
to the Chloromyxide. 
The following table shows the relations of Thélohan’s classification 
to the one now proposed: 
THELOHAN’S CLASSIFICATION. 
(Fusiform, lcapsuleat each extremity. Myxidium. 
| 
one aiet shell formed of two hollow-coneé valves 
[ capsules: Myxidians. Spores ? soldered along their bases. Oeratomyxa. 
No vacu- | Flattened-ovoid, more or less elongate. Myxosoma. 
ole, 2 or 4 , E 
capsules. | | Spherical. Spherospora. 
4 capsules: Chloromyxans..----- Chloromyxum. 
1 iodinophile ¢ Destitute of a tail; capsules 1 or 2. Ifyxobolus. 
yacuole; 1 or batyxobolans. Spore-shell - < 
2 capsules. ( With a tail; capsules 2. Henneguya. 
PROPOSED CLASSIFICATION. 
GENUS. FAMILY. CHARACTERS. 
Myxidium .....--.-+---- Myxidiide.....--- Bilateral but not antero-posterior symmetry; 
capsules in two groups right and left; no bi- 
valve shell; no vacuole. 
Ceratomy2@ ....-------- } Bilateral but not antero-posterior symmetry; 
| capsules in one group (at the anterior end); a 
Chloromyxum, et sub- | + Chloromyxide ..- bivalve shell, with the valve-junction plane 
gen. Spherospora (in- perpendicular to the longitudinal plane; no 
cluding Myxosoma). | vacuole. 
Myxobolus.-....-.------ Bilateral but not antero-posterior symmetry; 
capsules in one group (at the anterior end); a 
Myxobolide....-- bivalve shell with the valve-junction plane par- 
| allel to the longitudinal plane; an iodinophile 
Henneguyd ...-.-------- vacuole. 
Cystodiscus ...---------- Bilateral and antero-posterior symmetry; cap- 
sules in two groups, anterior and posterior; a 
| Oystodiscide..... bivalve shell with the valve-junction plane per- 
pendicular to the longitudinal plane; condition 
? Spheromyxa..----.--- of sporoplasm unknown. 
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