234 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
Railliet (loc. cit., 1890) further says that every one up to the present 
appears to bein accord as to the means of combating the disease. 
It is, above all, expedient to collect the diseased fish and to bury them 
at a certain depth and at a great distance from the water course. This 
is what was done on the Meuse and one has just seen that this course 
succeeded sufficiently well. Thus at the end of some years the disease 
appears to have left no traces. Thus Railliet saw taken, even at Méziéres, 
3 barbels, the smallest of which weighed 1:5 kilos or 3 pounds. 
Pfeiffer! says that prophylaxis must obviously be directed to the 
careful removal of all fishes dead of the disease. They should be 
burned or buried with caustic alkali. By this means, perhaps, the 
extermination of the barbel may yet be prevented. 
The only attempts at cure are cited by Railliet, who says that M. 
Ladague succeeded by opening the tumors in greatly prolonging the 
life of the fish, and sometimes in curing it. If, on the contrary, the 
disease is allowed to take its course the tumors increase rapidly and 
the fish soon dies. 
52. Myxobolus? sp. incert. Pl. 26, fig. 1. ~ 
Psorosperms of Cyprinus erythrophthalmus, Remak, 1852, Miiller’s Archiv., pp. 
144, 149, pl. 5, fig. 9B. 
Spore.—Tailed and untailed were seen. 
Habitat—From pigment follicles on wall of splenic artery of 
Leuciscus (Scardinius) erythrophthalmus L. 
Remarks.—As the relation between this form and Chloromyxum 
dujardini is at present doubtful, the present form is provisionally left 
separate. : 
53. Myxobolus sp. incert. Pl. 26, fig. 2. 
Globules of Cyprinus phoxinus Rayer, 1843, Rayer’s Archiv. de Méd. comp., I, 
pp. 58-9, pl. 9, fig. 13. 
Cysts.—In the single specimen observed, 2 in number, yellowish 
white, the size of a pin’s head; contents, a mass of ovoid spores. Ether 
rendered the cyst contents more transparent, ammonia more cloudy. 
Myxosporidium and spore unknown. 
Habitat.—Encysted on left side of head of Phoxinus phoxinus L., from - 
the Seule River. Disease apparently rare. 
54. Myxobolus oblongus Gurley, 1893. Pl. 26, figs. 3-6. 
(Psorosperms of Catostomus tuberculatus (Le Sueur), Miiller, 1841, Miiller’s 
Archiv., pp. 487-90, pl. 16, figs. 7-9; ib., Miiller, 1843, Rayer’s Archiv. de 
Méd. comp., I, p. 229, pl. 9, figs. 7-9; ib., Robin, 1853, Hist. Nat. d. Végét. 
Parasites, p. 301, pl. 14, figs. 9, 10.) 
Myxobolus oblongus, Bull. U. 8. Fish Com. for 1891, x1, p. 414; ib. Braun, 1894, 
Centralbl. f. Bakt. u. Parasitenkde, xv, p. 87. 
Myxosporidium unknown. 
Cyst.—Round or elliptic, not over 1 mm. in diameter; membrane 
1 Die Protozoen als Krankheitserreger, 2 ed., 1891, p. 110. 
