110 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
2. Are the present generic references of some species correct and are 
their structural characters accurately determined? While at present 
the force of analogy is not so absolutely overwhelming as to justify a 
positive assertion, I strongly suspect that species of genera now inde- 
terminate will ultimately tend to range themselves in accordance with 
the lines indicated: i. e., that species inhabiting gall bladders (Perugia’s 
“¢ Myxosporidium” congri, for example) will be found to be referable to 
nonvacuolate genera. 
GEOGRAPHICAL AND SEASONAL DISTRIBUTION. 
Out of 76 species of hosts and 96 forms of Myxosporidia (true and 
doubtfal; species 7 to 102) localities are known for only 27 species of 
hosts and 19 forms of Myxosporidia, and many of the localities are so 
vague that they amount to little. In the hope that future descriptions 
will supplement this glaring deficiency, a table is given showing all 
the localities and dates of collection heretofore reported. 
The condition of the data as regards season is even worse than that 
referring to locality. HEvenan approximate date of collection is known 
in only about 25 per cent of the forms, and yet of all classes of data 
this is certainly one of the most important. Many of the statements 
are general in the extreme (ce. g., ““Summer”), and in not a single instance 
has the temperature of the water been recorded. 
Geographical and seasonal distribution. 
n 
Oo 
Locality. Date. Host. Species. ae 
a 
Asia: 
NirtisGhieeesse=se—e mit May, June ...... Perea fluviatilis .........- Myxobolus sp. incert -.... 66 
Europe: 
Russia— | 
JOY) SSanripsoccenosr First of winter, | Stizostedion lucioperca--..| Myxobolus sp. incert --.-. 61 
May,June. | 
Germany— 
ING arg Siem ele | onto eeeee Gasterosteus aculeatus ...| Gen. incert. sp .------.---- 22 
Mixact Localitiyit iss o|emcet eae eee Carassius Carassius. -...-.. Myxobolus sp. incert -.--. 56 
Wieser: .-<.26o. o4ase eRe ee 4 vee aicius Wuweins. 9.5 32. aeac Myxidium lieberkiihnii-.-| 100 
IBM soe oSanse4esoe \eoenodoe toh aeaecollencase UO eee est osegedeoeseetlosecise GUYS srecessccsssescce 100 
BEUHIMO) Salas e ete ee ee eee aineteetateelclare ail ttre ar ie eee (oe Se SU re 0 steaocccbanee ee ene 100 
DOr eneeehee eas (ee ete pisel= = 3 Barbus barbus...--..--..- Myxobolus sp. incert -.--. 51 
ISN SS Jogcase5nates Sao sod 25 OS AseeaoS peeood Ge a AS SO EE Se ee G0 Le eee cee ees 51 
OT ASA B eee lhadses ustpanee ee votesby Gaoaeocsaee Myxidinum lieberkiihnii--..! 100 
JHIGEGH ya ee hos scc shoo) scantaedsensaeuese Barbus barbus-.---------- Myxobolus sp. incert ----. 51 
German rivers.-..-.. May, June ...--. Stizostedion lucioperca ...| Myxobolus sp. incert -..-- 61 
IDSs She sosber Be Sei) See Leuciscus rutilus....-.--- Chloromyxum dujardini..| 92 
DO seer ncias seep May, June | c-em OOsater rea ene cose see Myxobolus cycloides ..-... 58 
May 8, 18°%5 
Jan. 31,1839 
x IMs S64 5535550-4 May, June .:....| Perca fluviatilis -........- Myxobolus sp. incert ...-. 66 
rance: . | 
SOS COs saieste sie Mar.15 to Nov. | Palemon serratus....--.- Thelohania octospora. ---- 31 
15 ad max.: ; 
July 15 to Aug. 
31. | 
DO eeameme ce seh ier eetee woe ee ccc | Onus tricirratus........-.| Spheromyxa balbianii....| 99 
TOMES A aoase August, 1892....|...... do .| Ceratomyxa arcuata....-. 84 
sece4: do Myxidium incurvatum .-.-} 101 
Onus maculatus .....-.-.- Spheromyxa balbianii 99 
Crenilabrus melops...-.-- Sey xoulas molierl).-.=-- 46 
Blennius pholis.......-.-. Myxidium incurvatum -..| 101 
*The mention of this locality affords the only chance of an inferential correlation of this form with 
some one of the others known to live on the same fish, 
se ae ee 
