914 REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 
Relative to its generic relations Perugia says: 
This form might be referred to the genus Myxobolus, from which it seems to me 
to dilfer only by alittle. The different hosts and the form of the spores only might 
cause it to be regarded as a distinct species. 
40 Myxobolus sp.incert. Pl. 14, fig. 7. 
(Psotvsperm of Nais proboscidea, Lieberkiihn in Biitschli, 1882, Bronn’s Thier- 
Reich, 1, p. 590, pl. 38, fig. 23; ib., Thélohan, 1890, Annal. de Microgr., II, p. 
193; ib. Pfeiffer, 1890, Virchow’s Archiv. f. pathol. Anat. u. Physiol., CXXII, 
p. 557; ib. Braun, 1893, Centralbl. f. Bakt. u. Parasitenkde, x1v, p. 739.) 
No description. Its symmetry shows it to be a Myxobolus. Observed 
by Lieberkiihn, and communicated by him to Biitschli; published only 
by the latter.! 
Habitat.—Nais proboscidea (a worm). 
41 Myxobolus sp. incert. Pl. 15, figs. 1-6. 
Psorosperms of Esox lucius, Lieberkiihn, 1855, Mém. Cour. et Mém. Say. Etrang. 
Acad. Roy. Belg., XXvVI, p. 37, pl. 10, figs. 10-12, pl. 11, figs. 1-4; ? ib. Biitschli 
1882, Bronn’s Thier-Reich, 1, pl. 38, fig. 11. 
Cyst.—Size 8 mm. (0°31 inch) by 4:25 mm. (0°17 inch); contents “ granu- 
lar matter” alone, spores alone, or both “ granular matter” and spores, 
in variable proportion. 
Myxosporidium unknown. 
Spore.—Oval or circular, tailed or untailed; the 2 kinds often mixed 
without order in the same cyst. 
Habitat.—Cysts of branchiz of Lucius lucius L. (pike). 
It is hard to know what to do with this form. In spite of his asser- 
tion that tailed and untailed forms occur in the same cyst, Lieberkiihn 
appears to figure only untailed forms. In view of this, and provision- 
ally until some other observer shall confirm this observation, I prefer 
to recognize this as a “form” distinct from the tailed one having 
approximately the same habitat. (See also p. 256.) 
42 Myzxobolus oviformis Thélohan, 1892. Pl. 14, fig. 8. 
(‘‘Myxosporidian spore (MM. miilleri Biitschli?)” of Cyprinus carpio and of 
Gobio fluviatilis,? Thélohan, 1890, Annal. de Microgr., 11, pp. 200, 204, 209, 
210, 211, 213, pl. 1, figs.8-11; spore of C. carpio, Thélohan, 1890, Compt. 
Rend. Acad. Sci. Paris, Crx, p. 921). 
Myzxobolus oviformis Thélohan, Bull. Soc. philomat. Paris, tv, p. 177; ib., Gurley, 
1893, Bull. U.S. Fish Com. for 1891, x1, p. 414; ib., Braun, 1893, Centralbl. 
f. Bakt. u. Parasitenkde, xiv, p. 739; ib., Braun, 1894, Centralbl. f. Bakt. u. 
Parasitenkde, Xv, p. 87. 
Cyst and myxosporidium not mentioned. 
Spore.—Flattened-ovoid, with notably attenuate anterior extremity; 
length, 10 to 12 4; breadth, 84; capsules relatively large (6); nuclei 
ad plur., 3; vacuole, present. 
1 Braun’s language is slightly ambiguous: ‘Eine iiltere Notiz, von Lieberkiihn, 
erwihnt” the occurrence of Myxosporidia in invertebrates. 
2 An ambiguous expression of Lieberkiihn’s (Bull. Acad. Roy. Belg., 1854, XXxI, pt. 
2, pp. 22-23) may refer to an observation of a species upon the branchiz of this fish. 
