212 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 



of the spleen and tlie noncapsulate spores (developing spores; si)oro- 

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

 between the immature forms of fig. 5 from the spleen and the siaiilarly 

 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, state the 

 dimensions in the text, but on the plate he gives the multiplication 

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

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

 Eemak, that they are all one species. 



{h) That species is distinct from M. piriformis. Among the 3 criteria 

 cited by Th^lohan as distinguishing M. hracJii/ci/stis from M. jnr if or mis, 

 viz, spore-form, presence of 2 capsules and their small size, especial 

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

 index. 



Cyst and myxosporidium unknown. 



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

 tened-ovoid with a very acutely attenuated anterior extremity. 

 Length, 16 to 18 /<; greatest breadth, 7 or 8 //. 



Habitat. — Branchise and spleen of Tinea tinea L.; kidney of Misgur- 

 mis fossilis. 



36. Myxobolus inequalis Guiley, 1893. PL 13, fig. 2. 



(Psorospenns of Pimelodiis blochii Valenc, Miiller, 1811, Miillcr's Arcliiv., p. 



487, pi. 16, fig. 6a, h ; ib. Muller, 1813, Rayer's Arcliiv. de Mctl. couip., pi. 9, 



fig. 6; il. Robin, 1853, Hist. Nat. des V^get. Parasites, p. 299, pi. 14, fig. 8.) 

 Myxoholus inequalis, Bull. U. S. Fish Com. for 1891, xi, p. 414; Myxobolus 



incequalis [error] of Pimelodes [error] blochii, Brauiij 1894, Ceutralbl. f. 



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



Cyst and myxosporidium unknown. 



;Si;om— Length, 11 /u (0-0052'"); breadth, 7 /j. (0-0033'"); capsules 2, 

 of unequal size. 



Habitat. — On Pimelodus clarias Bloch (= Silurus clarias Valenc.) 

 from Guiana and Surinam. 



37. Myxobolus brachycj'-stis sp. nov. PI. 14, figs. 1-3. 



(Psorospcrms ofTinca chrysitis, Remak, 1852, Miiller's Arcliiv., pp. 144-146, pi. 5, 

 figs. 5, 7, 8.) 



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

 ler's figures) to Chloromyxum diijardini. 



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 i)igment follicles; pansporoblast always 

 monosporogenetic. In the developing spores Eemak 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. — Eemak gives this as the pigment follicles of the sijlecn and 



