212 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



of tbe spleen and the iioncapsulate spores (developing sjjoros; sjjoro- 

 blasts), also from the spleen, shown in Eemak's fig. 5. And, finally, 

 between the inimatiirc forms of fig. 5 from the spleen and the simihirly 

 immature forms from the kidney represented in Eemak's fig. 7, specific 

 identity seems almost certain. Another argument which is especially 

 worthy of note is the fact that the spores represented in all 3 figures 

 are almost exactly the same size. Kemak does not, it is true, statt; the 

 dimensions in the text, but on the plate he gives the multii)lication 

 ratio for the figures, and calculations from careful measurements of them 

 sliow that all of them agree very closely. I therefore think, with 

 liemak, that they are all one species. 



(/>) That species is distinct from M. piriformis. Among the 3 criteria 

 cited by Thelohan as distinguishing M. hrachyej/stis from ilf. piriformis, 

 viz, spore-form, presence of 2 cajisules and their small sixe, especial 

 emphasis should be laid upon the latter, that is ui)on the small capsular 

 index. 



Cyst and myxosporidium unknown. 



^jwre. — Pyriform; closely resembling a pumpkin seed; being flat- 

 tened-ovoid with a very acutely attenuated anterior extremity. 

 Length, 10 to 18 //; greatest breadth, 7 or 8 /<. 



Habitat. — Branchiae and sjileen of Tinea tinea L.j kidney of Misgur- 

 nns fossilis. 



36. Myxobolus inequalis Gurley, 1893. PI. 13, fig. 2. 



(rsorospernis of rimelodns hlocJiii Valcuc. , Miiller, 1811, Miillcr's Archiv., p. 



487, pi. 16, fig. 6a, b; ib. Miiller, 1843, Rayer'H Arcliiv. do Mi'^d. comp., pi. 9, 



fig. 6; ih. Robin, 18.53, Hist. Nat. des V6g6t. Parasites, p. 299, pi. 14, fig. 8.) 

 Myrobolus inequalis, Bull. U. S. Fisli Com. for 1891, xi, p. 414; Mtixoholus 



inwqnalis [error] of Pirnelodes [error] blochii, Brauu, 1894, Ceutralbl. f. 



Bakt. u. Parasitenkde, xv, p. 87. 



Cyst and myxosporidium unknown. 



Spore.— hQugth, 11 ju (0-005:^"'); breadth, 7 /x (0-0033'") 5 capsules 2, 

 of unequal size. 



Jfahitat. — On Pimelodus clarias Bloch (= iSilunis clarias Valenc.) 

 from Guiana and Surinam. 



37. Myxobolus brachycystis sp. nov. PI. 14, figs. 1-3. 



(rsorosperms o£Tinca chnjsitis, Remak, 1852, Miillor's Archiv., pp. 144-116, jil. .5, 

 figs. 5, 7, 8.) 



Compare carefully p. 211. Eemak compares it (by reference to Miil- 

 lcr's figures) to Chloromyxum dnjardini. 



Spore formation. — Pansporoblast: Oval vesicles usually situated on 

 the walls of the blood vessels of the kidney or spleen; either in connec- 

 tion with, or separate from, the pigment follicles; jiansporoblast always 

 monosporogenetic. In the developing spores Kemak not infrequently 

 missed the capsules, but comi)arison with developed forms which 

 occurred in other cases left no doubt as to their nature. 



Spore. — Pyriform, long drawn out. 



Habitat. — Kemak gives this as the pigment follicles of the spleen and 



